And here is the update;

I got a list of internals that went into the LS7 for the Colorado project from EPP (Exotic Performance Plus)

With 22lbs of boost, this is what is needed to keep the motor bullet proof.

EPP is doing a fantastic job on the motor……they are a big name in the industry. Dustin Portmess is the guy that built the motor at EPP.

Diamond Pistons 11596
Compstar Connecting Rods
Clevite H series rod (CB663HN) and main bearing (CB2199HX)
ARP main and head studs Total seal rings with an AP steel top ring
Comp Cam duration @ .050 is 236/246 on a 114 lobe separation
installed @ 113 intake centerline with .637/.650 lift Manley 5/16 one piece pushrods The heads were O-ringed at West Coast Cylinder Heads Valve springs are comp cams 26921kt

The engine is 428.69 CID. The bore is 4.130, and it has the stock LS-7 4" stroke crankshaft. The compression ratio is 9.37:1 The block was honed with a torque plate, and the crankshaft was computer balanced to
1/4 ounce/inch.


more to come folks...