i got a question i have a 436 chevy in my 87 iroc engine made 595hp,645ftlbs tq. on engine dyno. when installed in car put stealthram intake on but the power is nowhere near that would switching back to carb make that much difference.any help would be appreciated.

 

A lil more info on the Stealthram combo would be nice. Was it a 58mm TB or stock. who tuned it? Im also assuming the engine was dynoed carbureted?

 

yes it has 58mm throttle body, intake was also ported , it was dynoed with team g intake and holley 750 hp carburetor. im running commander 950 ecu that i tuned with wideband oxygen sensor running 13.5 afr at idle to 12.2 at wot.cam is comp cams custom grind 242/245 duration .617int.621 ex. solid roller.was just wondering if it would beneficial to switch back to carb.thx.

 

What exactly is the engine combo? Heads, cam, exhaust system, headers, ignition, etc..? Was it dyno'd with open headers? That will make a significant difference if its now got mufflers and full exhaust to the back on it, especially if its a small system, like a single 3" or something. That engine should have a 3" dual exhaust, or at least a 4" single at minimum.

Have you had it on a chassis dyno since the engine was installed? Has the EFI system been dyno tuned?

What transmission? Whats the converter stall speed?

From what I've been hearing, the HSR manifold is comparable, performance wise, to the LT1/LT4 manifolds, and there are LOTS of those guys making more power than you are with only very minor mods to the intake (like for the larger 58mm TB).

 

engine is 436 chevy 10.5 to 1 comp.rhs 200cc heads,comp cam solid roller,has 3 inch duals,hooker 1 3/4 longtubes,msd distributer cumputer controlled,400 th with 3600 stall converter.i havent had it on chassis dyno.just purchased wideband oxygen sensor to try and get it tuned a little better.just has hard time reving past 6000 rpm.