I have finally completed my overhaul and slight betterment to my -77 Grand prixes 400cid engine.
block was bored 30 over and honed. Nothing else was done this time. New bearings on all places.
Engine specs:
4x- 6 heads, new valves, springs and seats were modified for the new type of umbrella rubber seals.
252H Compcams camshaft
Compcams Rollertip rockers
Hy-Lift Johnson lifters, one did bottom stuck in dyno but reasemling it worked.
Sealed Power L2279NF30 Dome pistons -11cc
H-Beam Adept Performance rods, full flotating
Quadrajet, had to restrict my idle by pass channells to richen it enough.
Orginal log style manifolds, we could got more with better ones.
High flow water pump.
High pressure oilpump.
Engine made 342HP and 610Nm (450 ftlb) Torque, and would made more with better exhaust manifolds. But i didnt have them available. Im quite happy with the build.
https://youtu.be/siCtUL0shSs 2 Dyno pulls and timing adjustment beetween.
http://forums.maxperformanceinc.com/...1&d=1597621083