Got a 98 Silverado with 5.7 vortec, so for have added a CFM Technologies ported TBI, an Airaid intake spacer, K&N open air intake, Flowmaster 2 in/1 out muffler and a 3.5 inch tailpipe. No doubt the horsepower increase is impressive and the low-end torque is downright amazing.
Is my next move polished and ported intake manifold and heads/with bigger valve openings and smaller cc burn pan. Or should I go for more aggressive cam and headers, and then the intake and heads.
Note: this is a total sleeper, still in good shape but just an ordinary looking 98 chevy. I've retired and have the time, so would like to see how much power I can squeeze out of the old girl.

Thanks for any input
Smitty

 

performance mass air flow sensor, maybe have computer reprogrammed. good, low resistance plug wires. heads are actually good. maybe 3 angle valve job for better sealing (just had this done on my 98 vortec heads) have you done the cpi to mfi injector conversion yet?