ZZ4 heads
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Junior Member
Joined: Nov 2002
Posts: 33
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Car: 1991 RS
Engine: 87' 350 TPI
Transmission: 700
ZZ4 heads
I just had a question about these heads. If I was to put them on my '87 IROC engine, do I have to change my manifold or anything else like that or would they be a simple bolt on.
Redddragon91
Redddragon91
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
They have the pre-86 intake bolt pattern, and they lack the exhaust passages for EGR, which will cause an instant Check Engine light in your application if your car has TPI.
Other than that, they will bolt right on.
Other than that, they will bolt right on.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
"Check engine light"?
The system isn't really feedback with regard to EGR flow. It might tend ping a little more with EGR-like advance tables, and therefore knock retart, but that won't of itself set a code.
From what I hear...
The system isn't really feedback with regard to EGR flow. It might tend ping a little more with EGR-like advance tables, and therefore knock retart, but that won't of itself set a code.
From what I hear...
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