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-   -   GM performance zz383 Power numbers (https://www.thirdgen.org/forums/tech-general-engine/530102-gm-performance-zz383-power.html)

HonkyTonkMan 06-13-2009 06:01 PM

GM performance zz383 Power numbers
 
I have a GMP zz383 with the holley commander 950 engine mangement system and ha Stealth Ram intake. also the largest headers possible..

What kind of power can i get out of this ?
Is it possible to exeed the 425/449 numbers ?
Or is that the limit ? Emissions are not a subject here in norway on such old cars (1986 z28).

Damon 06-13-2009 09:55 PM

Re: GM performance zz383 Power numbers
 
I think it's possible. The engine was rated with a 4bbl carb and dual plane intake. The SteathRam and tunability of EFI in general could possibly get you a bit more power than the factory rating, if it's tuned sharp.

WILL85IROC 05-01-2011 05:37 PM

Re: GM performance zz383 Power numbers
 
would changing the cam produce more power? nice combo but i would need more from a 383...

Dialed_In 05-01-2011 11:03 PM

Re: GM performance zz383 Power numbers
 
I'd put it around 360-370 actual wheel HP. Heads, cam and compression of that engine will hold you back.

WILL85IROC 05-03-2011 11:43 AM

Re: GM performance zz383 Power numbers
 
anyone else have this combo with hp #'s ??? i wanna see pics too...

bullzz 06-04-2011 12:52 PM

Re: GM performance zz383 Power numbers
 
1 Attachment(s)
I got 340 HP to the wheel on my zz383 with dual plane manifold, hooker lt headers, and Holley Street Avenger 770cfm. I could probably squeeze another 10hp with better tuning of the carb and timing...

sofakingdom 06-04-2011 02:00 PM

Re: GM performance zz383 Power numbers
 
I doubt you'll get any more than that out of it.

The HSR only flows about 425 HP, if the motor is in pump-gas trim (mostly determined by the compression ratio... which DEFINITELY applies to the ZZ383). Can't make any more power than the amount of air that passes through it will allow. ;)

HonkyTonkMan 06-19-2011 05:54 PM

Re: GM performance zz383 Power numbers
 
ONLY FLOW 425 Hp ? 1000CFM is supposed to manage to feed more than 425 hp....!!!

Orr89RocZ 06-19-2011 06:43 PM

Re: GM performance zz383 Power numbers
 
I think it will do more than that. HSR shouldnt hinder the performance over a dual plane carb intake. HSR has room to port if you are in doubt... with mild porting i was able to make 400whp on my 383 with a decent cam/heads combo. Thats through the TPI air box too, although gutted. My buddy's overbored stock crank/rods 360" motor made 330whp at 5600 rpm and then power went haywire due to bad valve float with 280xfi cam. Would easily have been a 350whp car with good springs and that was with old 190 AFR heads that dont flow like the newer 195-ish cc heads out there today, and he was at low compression, 9.5 to 1 on aluminum heads


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