A cost effective choice compared to re-worked factory heads, our 205cc package features fully CNC ported intake and exhaust runners, and combustion chambers. Recommended for street, street/strip and towing applications with displacements up to 383 cubic inches, operating at or below 6300 RPM. A minimum 3.900" bore size is required to clear the supplied 2.020" valve. These heads are legal for use on 2005 and older emissions controlled vehicles, under CARB EO #D-250-4.

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.020” x 4.900" Overall Valve Length	AFR #7207
8mm Bead Lock Exhaust Valve, 1.600” x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6500, less than 235* duration, upgraded spring #8019 recommended for higher RPM & larger cams	AFR #8017
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042

 

205cc Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	147	214	249	284	296	301
Exh	111	150	209	225	230	233

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 3.900", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	205cc
Intake Port Dimension	3.275"H x 1.120"W x5/16 top 3/8 bottom
Intake Port Location	Stock
Exhaust Port Volume	84cc
Exhaust Port Dimension	1.415" H x 1.710" W
Exhaust Port Location	Stock
Combustion Chamber Size	66cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	3.900"
Flat Mill	.006" per cc 58cc Maximum
Minimum Cross Sectional Area	2.185 sq. in.
Spark Plug Dimensions	14mm x .750" w/Tapered Seat
CARB E.O.	#D-250-4

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM#12558573
Head Gasket	Cometic 3.930 .040” or AFR #6846
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

AFR's 215cc mongoose cylinder heads a recommended for moderate street or street/strip builds with displacements up to 408 cubic inches operating at or below 6500 RPM. This medium sized, high velocity torque monster flows 312 CFM @0.600" of lift.

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.020” x 4.900" Overall Valve Length	AFR #7207
8mm Bead Lock Exhaust Valve, 1.600” x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6500, less than 235* duration, upgraded spring #8019 recommended for higher RPM & larger cams	AFR #8017
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep	AFR #9059
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L	AFR #9051

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

215cc Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	149	215	259	293	300	303
Exh	111	150	209	225	230	233

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	215cc
Intake Port Dimension	3.275"H x 1.120"W x5/16 top 3/8 bottom
Intake Port Location	Stock
Exhaust Port Volume	85cc
Exhaust Port Dimension	1.415" H x 1.710" W
Exhaust Port Location	Stock
Combustion Chamber Size	65cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	3.900"
Flat Mill	.006" per cc 58cc Maximum
Minimum Cross Sectional Area	2.260 sq. in.
Spark Plug Dimensions	14mm x .750" w/Gasket Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM#12558573
Head Gasket	Cometic 4.160 .040" or AFR #6848
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

Our 230cc LS1 MONGOOSE cylinder heads are recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches operating at or below 7200 RPM. Capable of flowing 328 CFM at 0.650" lift with a 4.000" bore size.

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.080" x 4.900" Overall Valve Length	AFR #7208
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650” maximum lift, Max RPM 7000-7200	AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep	AFR #9059
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L	AFR #9051

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

230cc Small Bore Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	157	224	272	311	320	324
Exh	129	183	225	244	248	252

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 3.900", intake 3/4" radius plate exhaust, 1 3/4" curved pipe
 

230cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	158	230	282	320	325	328
Exh	129	183	225	244	248	252

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 3.900", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	230cc
Intake Port Dimension	3.250"H x 1.115"W x5/16 top 3/8 bottom
Intake Port Location	Stock
Exhaust Port Volume	86cc
Exhaust Port Dimension	1.385" H x 1.695" W
Exhaust Port Location	Stock
Combustion Chamber Size	62cc, 65cc, or 72cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	3.900"
Flat Mill - 62cc chamber	.006" per cc 58cc Maximum
Flat Mill - 72cc chamber	.006" per cc 67cc Maximum
Minimum Cross Sectional Area	2.425 sq. in.
Spark Plug Dimensions	14mm x .750" w/Tapered Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM#12558573
Head Gasket for Small Bore	Cometic 3.930 .040" or AFR #6846
Head Gasket for Large Bore	Cometic 4.160 .040" or AFR #6848
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

Step up your LS build with AFR’s 230cc cylinder heads—now produced with our new permanent-mold casting for tighter dimensional control, improved strength, and cleaner ports right out of the box. The available 6-head-bolt configuration boosts clamping force and head-gasket integrity under heat, boost, and nitrous, making these heads a rock-solid foundation for serious street and street/strip combinations.

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.080" x 4.900" Overall Valve Length	AFR #7208
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650” maximum lift, Max RPM 7000-7200	AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep	AFR #9059
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L	AFR #9051

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

 

230cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	158	230	282	320	325	328
Exh	129	183	225	244	248	252

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 3.900", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	230cc
Intake Port Dimension	3.250"H x 1.115"W x5/16 top 3/8 bottom
Intake Port Location	Stock
Exhaust Port Volume	86cc
Exhaust Port Dimension	1.385" H x 1.695" W
Exhaust Port Location	Stock
Combustion Chamber Size	62cc, 65cc, or 72cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	3.900"
Flat Mill - 62cc chamber	.006" per cc 58cc Maximum
Flat Mill - 72cc chamber	.006" per cc 67cc Maximum
Minimum Cross Sectional Area	2.425 sq. in.
Spark Plug Dimensions	14mm x .750" w/Tapered Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM#12558573
Head Gasket for Small Bore	Cometic 3.930 .040" or AFR #6846
Head Gasket for Large Bore	Cometic 4.160 .040" or AFR #6848
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

Our max effort cathedral port head for the LSX platform is recommended for race applications or radical "Pro Street" builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Requires a minimum bore size of 4.000" to clear the supplied 2.165" intake valve. CARB Legal for 2005 and older emissions controlled vehicles under CARB EO #D-250-4 with 65cc combustion chambers.

Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.165" x 4.900" Overall Valve Length	AFR #7211
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650” maximum lift, Max RPM 7000-7200	AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep	AFR #9060
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L	AFR #9051

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

245cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.550	.600	.650
Int	164	233	290	332	347	356	360
Exh	131	185	227	247	249	257	267

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	245cc
Intake Port Dimension	3.315"H x 1.145"W x 11/32 top 13/32 bottom
Intake Port Location	Stock
Exhaust Port Volume	88cc
Exhaust Port Dimension	1.495" H x 1.730" W
Exhaust Port Location	Stock
Combustion Chamber Size	65cc or 73cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill - 65cc chamber	.006" per cc 58cc Maximum
Flat Mill - 73cc chamber	.006" per cc 65cc Maximum
Minimum Cross Sectional Area	2.680 sq. in.
Spark Plug Dimensions	14mm x .750" w/Tapered Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM #12558573
Head Gasket	Cometic 4.200 .040" or AFR #6845
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

Built for big-air LS combos, AFR’s 245cc heads leverage our new permanent-mold casting to deliver exceptional strength, repeatability, and port finish—ideal for high-rpm, big-cube, and power-adder builds. The 6-head-bolt configuration adds critical clamping force for superior gasket life and stability under sustained load, making it the go-to choice when you’re leaning on the tune.

Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.165" x 4.900" Overall Valve Length	AFR #7211
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length	AFR #7228
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650” maximum lift, Max RPM 7000-7200	AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep	AFR #9060
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L	AFR #9051

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

245cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.550	.600	.650
Int	164	233	290	332	347	356	360
Exh	131	185	227	247	249	257	267

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	245cc
Intake Port Dimension	3.315"H x 1.145"W x 11/32 top 13/32 bottom
Intake Port Location	Stock
Exhaust Port Volume	88cc
Exhaust Port Dimension	1.495" H x 1.730" W
Exhaust Port Location	Stock
Combustion Chamber Size	65cc or 73cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill - 65cc chamber	.006" per cc 58cc Maximum
Flat Mill - 73cc chamber	.006" per cc 65cc Maximum
Minimum Cross Sectional Area	2.680 sq. in.
Spark Plug Dimensions	14mm x .750" w/Tapered Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.

Recommended Components:
Intake Port Gasket	GM or FAST
Exhaust Port Gasket	GM #12558573
Head Gasket	Cometic 4.200 .040" or AFR #6845
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

AFR’s 260cc LS3 "Mongoose" heads feature 100% CNC ported intake, exhaust and chambers using our advanced engineering and flow techniques to produce the ultimate Rectangle Port head available today. Featuring A356 aluminum castings, titanium retainers and the highest quality components, throughout. They’re designed for 4.000 or larger bore applications up to 454 CI, operating up to 7000 RPM. This product is street legal in 50 states from 2007 to 2016 emission controlled vehicles with a General Motors 6.2L LS engine. AFR heads are available bare (without parts), call our tech line for details.
 

Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.165" x 5.200" Overall Valve Length	AFR #7214
8mm Bead Lock Exhaust Valve, 1.600" x 5.205" Overall Valve Length	AFR #7212
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650 maximum lift, Max RPM 7000-7200	AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D	AFR #8512
7° Bead Lock Valve Keepers	AFR #9007
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep	AFR #9060
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep	AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.550" O.A.L	AFR #9053
Rocker Rail Stand	AFR #6040

 

260cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.600	.650	.700
Int	159	234	293	336	366	377	384
Exh	112	158	207	235	248	251	255

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 3/4" curved pipe
 

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	260cc
Intake Port Dimension	2.610"H x 1.300"W x 7/16° Radius
Intake Port Location	Stock
Exhaust Port Volume	95cc
Exhaust Port Dimension	1.540" H x 1.760" W
Exhaust Port Location	Stock
Combustion Chamber Size	69cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	12°
Valve Spring Pocket Diameter	1.490" O.D
Max Valve Spring Pocket Machining	1.510" O.D
Warning: Do not machine spring pad any deeper.
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill	.006" per cc 62cc Maximum
Minimum Cross Sectional Area	2.875 sq. in.
Spark Plug Dimensions	14mm x .750" w/ Tapered or Gasket Seat
Carb EO#

Recommended Components:
Intake Port Gasket	Factory GM or Aftermarket
Recommend Rockers - OEM w/ trunion upgrade Yella Terra 6733 w/ 5132 Valve Cover gasket.	Scorpion 1162
Exhaust Port Gasket	GM #12558573
Head Gasket	Cometic 4.160 Bore Size
Head Bolts (04+), ARP 134-3610	AFR #6334
Head Studs (04+), 2004 & Later Blocks ARP #234-4317, Pre 2004 Blocks ARP #234-4316	AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 92mm or 102mm
Spark Plug Starting Range	NGK TR55
Pushrods: Longer than Stock (see instructions for details)

• Hydraulic Roller Spring 1.290 O.D.
• Premium Grade Chrome Silicon
• 140 lbs. on seat
• .600” max lift
• Max RPM 6300-6500
• SBC/SBF Steel Retainer: 8514
• SBC/SBF Titanium Retainer: 8515
• SBC/SBF Valve Lock: 9007
• LSx Titanium Retainer: 8512
• LSx Valve Lock: 9007
• (1 Piece) or (Set of 16)

• 8019-1 - Contains 1 Spring
• 8019-16 - Contains 16 Springs
• Hydraulic Roller Spring 1.270 O.D.
• Premium Grade Chrome Silicon
• 155 lbs. on seat
• .650” max lift
• Max RPM 7000-7200
• SBC/SBF Steel Retainer: 8514
• SBC/SBF Titanium Retainer: 8515
• SBC/SBF Valve Lock: 9007
• LSx Titanium Retainer: 8512
• LSx Valve Lock: 9007
• (1 Piece) or (Set of 16)

• O.D. Spring Cup 1.380 OD x 1.300 ID x .570 ID
• Fits 8017 & 8019 spring
• (1 Piece) or (Set of 16)

• 7 degree Valve Locks for 8mm stem diameter
• For use with spring AFR 8017 & 8019
• (1 Piece) or (Set of 16)

AFR's 238 LS3 Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance.  The AFR 238cc LS3 Enforcer is the first Enforcer casting with 100% AFR design.  With a smaller valve and port, this head outflows your OE LS3 casting by up to 20CFM at low lifts, offering greater performance potential. This budget friendly head is perfect for your OEM engine operating below 6300 RPM. They come fully assembled with the identical components found in our higher end CNC ported cylinder heads; such as PAC Racing springs, viton valve seals, machined bead valve locks (not stamped), hardened spring seats, and our one piece 8mm 21-4N/21-8N Stainless Steel valves. They are available without any parts for the DIY. Sold as a single piece, 2 are required per engine.  Please see footnotes for additional information.

Basic Package Components
100% As Cast Intake, Exhaust, and Combustion Chambers
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.080" x 5.200" Overall Valve Length	AFR #7241
8mm Bead Lock Exhaust Valve, 1.600" x 5.205" Overall Valve Length	AFR #7212
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs. on seat, .600 maximum lift, Max RPM 6300-6500	AFR #8017
7° Steel Retainers 1.245" O.D x .880" I.D x .655" I.D	AFR #8514
7° Bead Lock Valve Keepers	AFR #9007
Viton Valve Seals .600" O.D x .495" I.D	AFR #6615
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042
Rocker Rail Stand	AFR #6040

238cc LS3 As Cast Flow Chart
	.200	.300	.400	.500	.550	.600	.650
Int	157	229	276	307	315	308	308
Exh	112	152	182	204	209	215	217

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm LSx 2.000 OD Int Valve - 4.900" OAL, For Small bore 5.3L engines	AFR #7236
8mm LSx 1.570 Exh Valve - 4.915" OAL, For Small bore 5.3L engines	AFR #7235
Pacaloy Hydraulic Roller Spring 1.290 O.D., Premium Grade Chrome Silicon	AFR #8017
Steel 7 degree Retainer 1.245 OD x .880 ID x .655 ID	AFR #8514
7° Bead Lock Valve Keepers	AFR #9007*
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D	AFR #8042

 

214cc Competition Flow Chart
	.200	.300	.400	.500	.550	.600
Int	156	206	237	271	283	293
Exh	119	160	192	214	219	225

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 3.780", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	214cc
Intake Port Dimension	3.275"H x 1.120"W x5/16 top 3/8 bottom
Intake Port Location	Stock
Exhaust Port Volume	90.2cc
Exhaust Port Dimension	1.415" H x 1.710" W
Exhaust Port Location	Stock
Combustion Chamber Size	65cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	15°
Valve Spring Pocket Diameter	1.510" O.D
Max Valve Spring Pocket Machining	1.525" O.D
Deck Thickness	.750"
Minimum Bore Diameter	3.780"
Flat Mill	.006" per cc 58cc Maximum
Spark Plug Dimensions	14mm x .750" w/Tapered Seat

Recommended Components:
Intake Port Gasket	GM or Aftermarket
Exhaust Port Gasket	GM#12558573
Head Gasket	Cometic 3.930 Bore Size
Head Bolts (97-03)	ARP 134-3609 or AFR #6330
Head Studs (97-03)	ARP 234-4110 or AFR #6331
Head Bolts (04+)	ARP 134-3610 or AFR #6334
Head Studs (04+)	ARP 234-4317 or AFR #6335
Suggested Manifold	FAST 92mm, or 102mm
Spark Plug Starting Range	NGK TR55

AFR’s 270cc Big-Valve LS3 cylinder head is designed to move serious air where modern LS3/rectangle-port engines make power. The 2.200" intake valve increases curtain area and intake charge efficiency, supporting strong mid-range and sustained top-end. Designed around the 6-bolt option to enhanced head-gasket stability under elevated cylinder pressures that are ideal for high-boost and heavy nitrous, these same heads are also available in a 4-bolt configuration upon request for those straightforward fitments on traditional LS blocks and gaskets. Whether naturally aspirated or on the sauce, this head gives your LS3 the breathing capacity and sealing strategy to grow with your tune.

Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
Intake Valve 8mm LS3 Solid Stem 2.200 Intake , 5.200 OAL  7215 Exhaust Valve 8mm LS3 Solid Stem 1.570 Exh Valve, 5.205 OAL  7217 Spring Pacaloy Hydraulic Roller Spring 1.270 O.D., Premium Grade Chrome Silicon 8019 Retainer LS1 Titanium 7 degree Retainer 1.250 OD x .885 ID x .655 8512 Valve Lock LS1 7 degree Machined Hardened Steel Valve Locks - Stock Style Bead Lock 9007 Rocker Stud N/A N/A Guide Plate N/A N/A Valve Seal 8mm SBC, SBF, LS1 Viton Rubber Valve Stem Seal, .600 OD x .495 ID 6612 Spring Locator O.D. Spring Cup 1.380 OD x 1.300 ID x .570 ID (Fits 8017 &8019 spring) 8042 Intake Seat AFR SB Chevy & LS3 Intake Seat 2.200 OD x 1.750 ID x .375 9060 Exhaust Seat AFR SB Ford/LS1/LS3 Exhaust Seat 1.650 OD x 1.350 ID x .375 9069 Guide LS3 8mm Bronze Guide, .502 OD 9053 Rocker Support Rail LS3 Rocker Arm Rails 6040 Rocker Support Rail Lube LS3 Rocker Support Rail Lube#3 6041

 

270cc Large Bore Competition Flow Chart
	.200	.300	.400	.500	.600	.650	.700
Int	159	236	299	344	376	384	389
Exh	116	166	211	230	238	242	245

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 3/4" curved pipe
 

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	270cc
Intake Port Dimension	2.610"H x 1.300"W x 7/16° Radius
Intake Port Location	Stock
Exhaust Port Volume	93cc
Exhaust Port Dimension	1.540" H x 1.760" W
Exhaust Port Location	Stock
Combustion Chamber Size	69cc
Valve Cover Bolt Pattern	Center Bolt
Valve Angle	12°
Valve Spring Pocket Diameter	1.490" O.D
Max Valve Spring Pocket Machining	1.510" O.D
Warning: Do not machine spring pad any deeper.
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill	.006" per cc 62cc Maximum
Minimum Cross Sectional Area	3.00 sq. in.
Spark Plug Dimensions	14mm x .750" w/ Tapered or Gasket Seat
Carb EO#

Recommended Components:
Intake Port Gasket	Factory GM or Aftermarket
Recommend Rockers - OEM w/ trunion upgrade Yella Terra 6733 w/ 5132 Valve Cover gasket.	Scorpion 1162
Exhaust Port Gasket	GM #12558573
Head Gasket	Cometic 4.160 Bore Size
Head Bolts (04+), ARP 134-3610	AFR #6334
Head Studs (04+), 2004 & Later Blocks ARP #234-4317, Pre 2004 Blocks ARP #234-4316	AFR #6335
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	FAST 92mm or 102mm
Spark Plug Starting Range	NGK TR55