AFR 165cc SBF Street Cylinder Head
The Small Port, High Velocity, Emission Legal Torque
Monster
These heads come ready for the maximum street/strip Small Block Ford performance possible. These 165cc performance heads are non-emissions legal and come with lightweight 8mm 1.900 intake valves and 1.600 exhaust valves. As well, they come with 58cc combustion chambers and a 70cc ultra high flowing nitrous exhaust port. With AFR´s trademark 3/4” thick head deck, it´s no problem handling that additional cylinder pressure. Each head is also drilled with 1/2” head bolt for maximum head gasket retention as a standard feature of this serious race piece in street design.
Note:
Hydraulic roller cams typically experience valve float at 6000-6200
rpm because of their fast ramp rates. AFR suggests you upgrade your
springs to AFR part #8605, 1.290 O.D. with higher spring pressures
to reduce chances of valve float associated with rpm´s 6200 or
higher. (see footnotes here)
Note:Competition package exhaust port is raised .125 over stock.
165cc SBF Street Cylinder Head Flow Chart
Tested on 4.060 Bore
165cc SBF Competition Package Cylinder Head Flow Chart
Tested on 4.060 Bore
165cc SBF Aluminum Cylinder Head Nitrous Exhaust Flow Chart
Tested on 4.060 Bore
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Radiused Valve Job
AFR #7249
Bead Lock Intake Valve, 1.900" stud mount
AFR #7250
Bead Lock Exhaust Valve, 1.600" stud mount
AFR #8017
1.290" OD Hydraulic Dual Valve Spring, 135 lbs on seat, .600" maximum lift (upgrades available)
Comp Pkg #8019
.600" maximum lift (upgrades available), #8019 1.270 OD
Specifications, Features, and Optional Supporting Components
100 ft.lbs. with 1/2” stud
Head Torque
55-60 ft. lbs
Rocker Stud Torque
25-30 ft lbs.
Rocker Pedestal Torque
AFR #6828
Intake Port Gasket, 1.200" X 2.000" w/ 3/8" radius, Fel-Pro #1250
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6323
SBF 7/16" Head Bolt Kit, ARP #154-3701
AFR #6322
SBF 7/16" Bolt, Head Stud Kit, ARP #254-4401
Victor Jr.
Suggested Manifold
Autolite 3924
Spark Plug Starting Range
58cc
Combustion Chambers
Can be cut to 1.625, no deeper
Spring Pocket
Standard
Valve Spacing
Standard, will not accept rail rocker arms
Rocker Arms
Standard
Valve Angle
.008” per cc
Angle Mill (10cc Maximum Optional Mill)
.006” per cc
Flat Mill (4cc Maximum Optional Mill)
Note: Milling head deck will affect flow numbers |
