One pair of Bare 12 Degree Inline LS7 12D 2.9" MCSA Port BE cylinder heads CNC ported and valve jobbed with CHE valve guides and CHE Ductile Iron valve seats. Standard height exhaust port fits all existing headers.
Developed by Greg Good these are the smallest aftermarket LS7 port cylinder heads available at just 2.9" of Minimum Cross Section, yet flow an astounding 420CFM, with 310 CFM at just .400" lift. The heads share the same optimized valve locations as our record setting BE LS 12D Oval Port Cylinder Heads with 2.250" Intake valves and 1.600" Exhaust Valve flowing over 280 CFM.
Standard valve stem size is 5/16" with valve lengths of 5.8" . A 1.600" diameter valve spring pad can accommodate a 2.1" installed height
They feature a highly efficient 45cc chamber that can be had with softening if necessary. Available with CHE Ductile Iron Valve Seats or CHE Bronze Valve Seats.
Heads require aftermarket shaft mount rockers available from either Crower (Cast Stainless P/N 74435F - Billet Steel P/N 74435B) or T&D Machine (Billet Steel P/N 2482) and will likely require aftermarket pistons, or modification to existing pistons. Aftermarket Pistons are available from Diamond, Ross and others.
The LS7 2.9" version have the best atomization possible for a port of this size and have made 930HP on a 440 LS Dirt Late Model Engine without the assistance of a Dry Sump - Vacuum Pump along with a 10 degree smaller camshaft than other comparable results.
They are a perfect match for our 4.0, 4.5 and 5.0 LS BA Intake Manifolds allowing for complete customization for your intended HP requirements."