my mods are in the sig. i just put the le2 heads on the car and its only pulling 1-4 inchs of vaccuum and it doest want to idle and also ops and backfires under throttle. what could be causing this. i already had the cc503 and everything worked fine. could it be my valves arnt adjusted right?

 

Valve too tight= poor vacuum. Start there.

 

ok thanks,, i just wanted someone to confirm that before i started tearing it down to adjust them. the heads wouldnt effect vacuum would it?

 

As long as the valves close, nothing in the heads should be a vacuum issue. The intake manifold gasket to head seal would need to be tight, too.

 

ok, i sprayed starting fluid around the intake and it didnt bog so i assume its not that. but then again i could be wrong. wouldnt be the first time haha