GM factory LS3/L92 heads, these factory castings are intended for those looking for all out performance from their heads. Maximum potential is achieved, great detail is spent in reshaping the bowl areas, streamline the guides, extensive intake and exhaust runner work along with reshaping the combustion chamber, providing you with horsepower gains unlike any other with our heads! Available through Xtreme CFM, done up the way we know best, to provide you with the most power producing head out there!


All xtreme cfm cylinder heads have gone through extensive research and development to provide you with the most powerful "out of the box" heads available on the market.


In development, our main objective was to provide the highest flow possible without ever sacrificing air speed in order to achieve it and staying within strict sizing constraints of each port. Not just emphasizing on flow alone, all aspects of the port were addressed with proper port shape, velocity, cross section and volume, with the end result of an extremely efficient head.

Price:  $1350.00

Fully machined finished bare castings: (base price)


Call for options and pricing, all heads are custom built to customers specifications.

Customer supplied core

GM Factory LS3/L92 Heads


Price:  $1600.00

Bare just portwork

Complete with Spring Kit Titanium Retainers