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09-07-2008 07:52 PM #1
new top end and no more power???
i just did a head, cam and intake swap on my 350. everything i did are as follows:
Trick Flow 195cc Heads with 62cc chambers
Summit 1105 camshaft (224*/234* @.050) and lifters
Pro Magnum 1.6 Roller Rockers
new pushrods.....yes, i checked the geometry
Felpro performance ultra thin shim gasket .015 compressed thickness
Ported High Rise intake manifold w/spacer ported to the plenum
rebuilt carter 625 carb
new HEI distributor w/MSD rev limiting module
new wires, spark plugs, starter
i put all this on the factory 74 short block. i'm assuming there about -20cc dish pistons. therefore, giving me a compression ratio just over 9.25:1
now i'm not sure what going on...i've adjusted the valves 3 times because i thought that's what it was and that i just kept messing up somehow. but now i know that's not the case.
before i did the swap i was getting about 115 to 125psi cranking compression. now i'm only getting 100 tops!!!!! and the power is horrible. according to Comp Cams Dynosim, i should be making about 385hp. i have used this program on several of my friends cars ('69 firebird, 92 trans am, 69 camaro, etc.) and surprisingly enough, for all their dyno'd cars, this program has been within 5hp on ALL OF THEM. i know this program works very well.
there is no detonation, no smoke coming out of the exhaust, my a/f ratio is between 12.5:1 and 13.5:1 from idle to redline, no driving quality issues other than just no power.
what is going on? i've been frustrated with this for weeks
PLEASE HELP ME
thanks
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