I have a fresh built 383 with afr i95 heads comp 248 in 254 exh with 1.6in .600lift , and 1.5 exh .580lift @ .50 hyd roller slp runners accell base 52 mm throttle body and30lbs svo inj. Pistns are srp forged and ccmpression 10:1
I also have a ed wright custom burned prom. Timing is set at 8 degrees intial andfuelpressure is @ 50 lbs with the vacuum connected ! I have not sensed any vacuum leaks and engine idles very well w/ no surging or variance any help guys?

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My initial shot is you are running rich.

 

I agree you are probably too rich. If you have an AFPR, you might want to try lowering the fuel pressure. But I think that those 30 lb injectors are too much for your set-up. You might want to try 24 lb.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

I'd go along with the above, too much fuel, did Fast Chip know the injector size? ALso that they're SVO's?

I'd start by lowering the FP to 45 or so, and try advancing the base timing a bit too. That cam could probably take more initial timing.

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One more thing, set your FP with the vacuum disconnected from the AFPR to simulate WOT pressure. Could be that 50PSI is what you need, but set it with the vacuum line disconnected (and plugged).

[This message has been edited by 8Mike9 (edited July 23, 2001).]

 

Thanks guys!!! Illtake the advice and adjust fuel pressure and timing accordingly and yes ed knew they were 30lbs svo if this does not cure the problem ill go to the 24 lbs svo and recalibrated prom !!

 

I always thought that rich ment cool exhaust and lean ment hot exhaust. Thats how the funny car guys tune. I also heard that timing will effect exhaust temp.