ZZ4 Engine
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Joined: Nov 2005
Posts: 386
Likes: 1
From: Maryland
Car: 1987 IROC-Z
Engine: 5.7 TPI
Transmission: 700-R4
Axle/Gears: 2.73
ZZ4 Engine
I read somewhere that the ZZ4 engine use the same block as the 350 in the I IROC. 
Is this true? 
Reason I am asking is if I have to replace my block I can just get the ZZ4 block as a replacement. Thanks 
Is this true? Reason I am asking is if I have to replace my block I can just get the ZZ4 block as a replacement. Thanks 
Supreme Member
Joined: Jul 2003
Posts: 1,236
Likes: 0
From: KY
Car: 87IROC, 740iBMW, 328iBMW, 86GMC
Engine: 5.7, 4.4LV8, 2.8, 6.0
Transmission: Manuals & Auto's
Axle/Gears: 3.27, 3.42
Re: ZZ4 Engine
Review the spec's in the attachment. The diff is that your IROC's block probably has only two bolt main caps.
http://paceperformance.com/index.asp...D&ProdID=22861
http://paceperformance.com/index.asp...D&ProdID=22861
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