how many zl1 motors were made

[ZL1#17]

Is there a cast date on the block? Is there a number below the cast date? Also look at the back of the block in line with the distributor there should be a number stamped there also.

[TXSS]

For those that are interested in the new ZL-1 block here are some pics of mine right out of the crate. After taking it to the machine shop they have had a stream of people coming by to see it and commenting on it's high quality. I know I'm very happy with it. Not quite the nostalgia of the old one but a much better built and looking block.

[Xplantdad]

That's a cool engine Rick!

[mr396]

I found this in an old 1987 muscle car review.sorry this is as clear as I can make it,

[PeteLeathersac]

Although helpful Les, Preve's listing above shows only F-body suffix ZL1 motors and doesn't appear to include the Vette ZL1's nor any supplied to McLaren and other Can-Am teams etc. . Isn't there something about 5 or 7 'Vette ZL1 motors being originally produced then some returned? . Can the Can-Am motors can be referred to as a ZLI since they're a different displacement? . Are all the Winters Alum. blocks the same casting number? . Perhaps the question could be....what other GM-Winters Alum. block motors were released to add to these known F-car engines resulting in what Grand Total? ~ Pete

[71-LS6]

Can someone please point out the EXTERNAL differences, between the new block and the old block? I want to do a ZL1 clone for FS/FAST racing, and I've about given up on finding an original block to work with.

[Kim_Howie]

The new block has thicker deck and main bearing area. Good for 900 HP. What I have been told is anything over 800HP on the org blocks BOOM They won't hold up.

[Kim_Howie]

Dah Steve I didn't read your question right. The block outside looks very close to org. blocks. There is no winters flake on the new one also the grain look of the block is different. Hopes this helps.

[Kim_Howie]

Rick, What was the # of your block on the paper that was att. to the block mine is ici-016