Thanks to the other members for the solid info on the ZZ4 engine swap. I thought I had done all the homework but missed the reverse rotation on the water pump. I just tore the car down yesterday. I have the serpentine belt system so I guess the reverse direction probably applies to me. I had been going by the GM instructions for the switch on a carb intake 1987 305 - didn't notice the belts. Any other potential pitfalls that I might run into? I will have to pass smog in Ca. and am doing the Corvette EGR w/ legal headers. Thanks in advance.

 

I assume this is a TPI swap if so you will need to take the distributor gear off and swap it with the ZZ4 distributor.

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1991 Z28 ZZ4 with LPE superram base, SLP runners, LPE 58mm T-body,Random Technology ramair,TES headers,24#svo injectors,and just about every other bolt on that there is. Just got a ZEX nitrous kit!

 

With regards to the need to change the distributor gear from the ZZ4 distributor to the 305 TPI distributor:

It turns out that according to the parts folks at my GM dealer that the 1988 TPI 305 has the correct gear already in place (they have the same GM part #'s). This possibility is backed by GM in their 1987 Camaro 305 (carburated) ZZ4 swap info sheet -some distributors do not need to have the gear changed. The exact wording is as follows:

" If you are installing an H.O. engine (ZZ4) in a 1987 LG4 Camaro, the distributor already has the correct gear. If you are installing an H.O. engine in a 1983-86 L69 or 1982-1986 LG4 you must replace the distributor drive gear as shown." Suffice it to say that there are some exceptions to the rule. I am assuming that the GM parts person is correct but in the face some of the misinformation I have received from GM lately - I think I'll change the gear. Thanks.