HP comparo ???
Thread Starter
Race Director
Joined: Sep 2004
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
HP comparo ???
this is a rather odd question that I am curious about...
The GM ZZ4 motor that can be purchased at virtually any speed shop is advertised as 355hp and 405 lbs of torque. It has 10:1 compression, 170cc heads, smaller valves, cam (i think) and lower quality parts compared to my LT4. Why is this motor, on paper at least, seem to out perform my motor that, on paper, is a better motor... or are my facts comfused???
The GM ZZ4 motor that can be purchased at virtually any speed shop is advertised as 355hp and 405 lbs of torque. It has 10:1 compression, 170cc heads, smaller valves, cam (i think) and lower quality parts compared to my LT4. Why is this motor, on paper at least, seem to out perform my motor that, on paper, is a better motor... or are my facts comfused???
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
the ZZ4 is not a smog motor.
It is not technically legal for newer cars... even tho it's quite commonly installed in mid 80s C4s.
I would not say the parts are "lower quality", just different.
It is not technically legal for newer cars... even tho it's quite commonly installed in mid 80s C4s.
I would not say the parts are "lower quality", just different.
Race Director
Joined: May 2001
Posts: 14,165
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I've seen a few ZZ4 short block motors come through and they haven't really impressed me all that much. The ones I've seen have had the TPI intake bolted back on top of them, which pretty much made them suck *****.
It's all about the right combination.
It's all about the right combination.
Team Owner
Joined: Sep 2001
Posts: 62,140
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
ZZ4 is carbed and has a slightly bigger cam. GM doesnt have to make it smog legal, however with tuning it can easily be made legal.
Its probably also rated with headers and without cats attached, so its going to drop when you put all the OE exhaust on.
Its probably also rated with headers and without cats attached, so its going to drop when you put all the OE exhaust on.
