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Old 06-13-2009, 05:01 PM   #1
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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).
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Old 06-13-2009, 08:55 PM   #2
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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.
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Old 05-01-2011, 04:37 PM   #3
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Re: GM performance zz383 Power numbers

would changing the cam produce more power? nice combo but i would need more from a 383...
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Old 05-01-2011, 10:03 PM   #4
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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.
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Old 05-03-2011, 10:43 AM   #5
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Re: GM performance zz383 Power numbers

anyone else have this combo with hp #'s ??? i wanna see pics too...
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Old 06-04-2011, 11:52 AM   #6
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Re: GM performance zz383 Power numbers

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...
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Old 06-04-2011, 01:00 PM   #7
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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.
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Old 06-19-2011, 04:54 PM   #8
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Re: GM performance zz383 Power numbers

ONLY FLOW 425 Hp ? 1000CFM is supposed to manage to feed more than 425 hp....!!!
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Old 06-19-2011, 05:43 PM   #9
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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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Old 06-19-2011, 05:43 PM
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