245cc LSX Mongoose Strip Aluminum Cylinder Heads

Our Max Effort Cathedral Port Offering

A tremendous amount of time and energy was invested to bring you our 245cc LS1/LS2/LS6 Gen III head what represents the pinnacle in cathedral design bolt on performance. With over 350 CFM's available it has intake flow numbers approaching GM's famed (and much larger) LS7 head with much stronger exhaust flow in comparison. This head is our take no prisoners LSX cathedral shaped offering and its focus is large displacement combinations (415 - 454 CID) with a minimum bore size of 4.060. It requires a head gasket bore of 4.200 or larger and comes standard equipped with lightweight 2.160 intake valves / 1.600 exhaust. Another unique feature of this head is that it is “solid roller friendly” having been designed and machined to accept larger .375 pushrods without additional clearancing (in most applications) and comes direct from the factory with 1.570 spring pockets (Note: Under no condition can these pockets be machined deeper). With an aggressive set-up this head is capable of producing power in the 700 HP range while still providing gobs of low and midrange torque. It is still a factory direct bolt on (see footnotes here) with standard length valves, stock valve train geometry, and everything in their respective OEM locations. It of course comes standard equipment with AFR's trademark 3/4” head deck and the same rugged castings found in the rest of the AFR LSX line up. Make sure you’re packing lots of displacement to fully realize the benefits this head can offer you and hang on when its time to go WOT!

Note:

Hydraulic roller cams in "LS" Gen III engines typcially experience valve float at 6600-6800 RPM's. If you are using aftermarket rocker arms valve float will become prominent and AFR highly recommends upgrading to our #8019 spring. If you plan on running over .600 gross valve lift and/or 6600 RPM, AFR suggests you upgrade your springs to AFR part #8019. Our upgrade spring has higher seat and open pressures (155/410+) to better reduce the risk of valve float in more aggressive applications.

FYI:

245cc Large Bore LSX Aluminum Cylinder Head Flow Chart

Tested on 4.155 bore

AFR #7211 Bead Lock Intake Valve, 2.160" standard length

AFR #7228 Bead Lock Exhaust Valve, 1.600" staindard length

AFR #8019 1.290" OD Hydraulic Valve Spring with dampener, 135 lbs. on seat, .600: maximum lift

AFR #8512 7° 1.250 Titanium Retainers

AFR #9007 7° Bead Lock Valve Keepers

AFR #6612 Viton Valve Seals

AFR #8042 Hardened Spring Cup

AFR #9060 Intake Valve Seats

AFR #9069 Exhaust Valve Seats

AFR #9051 Bronze Valve Guides

AFR #6859 or GM#12558573 Exhaust Port Gasket Fel-Pro #1440

AFR #6848 Cometic Head Gasket

AFR #6330 6 pt. Head Bolts

AFR #6331 6 pt. Head Studs

AFR #6332 12 pt. Head Studs

AFR #6328 Head Bolt Washers

AFR #6329 Head Bolt Washers

Note: Milling head deck will affect flow numbers.