ok so ive had this build done for over 2 years now and have not had time to figure out wats wrong...but im ready to start racing it so its Time) lol but it a
5k mile lt1 350
cc503
le2 heads
comp r lifters
crane daul valve springs
1.6 pro mag S/A rockers
hardened push rods
le2 ported intake
42lb injectors
lt headers
full exhaust
and a 150 shot!!! if i can figure out what the prob is first!!lol

the AFR is perfect!! mail order pcmforless...
but the car stops making power at 5200rpm???
i will post the dyno graph ASAP
i am lost i dont know what could cause this???
it only puts down like 320rwhp and 345rwtq...throu a 6 speed?? any thoughts guys

 

it's hard to say without seeing the graph....how much comp. are you running, what kind of fuel, what do you have for ignition, etc,etc..... There are a lot of variables that go into diagnosing an issue such as the one you have. Does it plateau or does it spike and drop? Is there any detonation going on? Unfortunately, it's hard to say. Find a tuner in your area and strap 'er down and see what you can do with it, is about the only advice I can give you currently

 

Mine stops making power at 5800rpm. I was told it was my 987 springs.