About the ZL-1 engines

[Eddie M.]

From what I been told GM had 500 ZL1 blocks made and only around 300 made it out the door because of casting flaws but don't hold me to this.This is just what i heard [img]/ubbthreads/images/graemlins/dunno.gif[/img]

[sYc Yenko]

I saw a ZL-1 block on the net, And it had a Yenko stamped logo on the frunt, That what cunfused me
Cheers [img]/ubbthreads/images/graemlins/beers.gif[/img]

[Turbo_Jet]

I believe Don Yenko sold aluminum blocks over the counter through his dealership in the mid '70s. That is most likely what you saw. Dan [img]/ubbthreads/images/graemlins/[/img]

[69LM1]

There was a early 70ish yenko block on ebay, oh about 2 months ago I think. Can't remember what it went for, but it was up there (12-15k I *think*).
It had what looked like the yenko stamp cast into the block.
Rich

[jfkheat]

Last one I saw on Ebay sold for $14,000. Here is the link.
James

http://cgi.ebay.com/ebaymotors/ws/eB...category=33615

[Unreal]

Looks to me like the Yenko Crest was ground off....I suspect because a "real" ZL1 would be worth more than one maked from one of Yenko's racing motors.

[jfkheat]

According to the info I have, the casting # on the block is a 69 ZL1. Did the later blocks have the same casting #?
James

BLOCK:
#3946052 1969 427 430 ZL-1, 4 bolt, aluminum

HEADS:
#3946074 1969-71 396,402,454 375 L-89, 427 430 L-88/ZL-1
Open 118.0 425, 465 LS-6/LS-7, round ex

[Eddie M.]

The Yenko block i have has the same casting number as the ZL1 block

[GMH454]

If you go back over recent threads in the last month (sorry can't dig it out ..got to rush) Ed Cuneen (I think ) advised that Don made ZL-1s from the original tooling but had to modify..grind off part of Winters trade mark. These blocks may also not be numbered or dated as the originals are, and probably don't have the stamped sequence number, or quality control marks that "real " 69 blocks have.

Later Yenko blocks may be bigger and stronger, mine is .90
over, but they also have "Yenko" style trade marks.

So there are:-
ZL-1s...what we all refer to and what was stuffed into Camaros, Vettes (and early Can-Am cars )
Reynolds Blocks up to 490 cubes and in Can Am cars in the later period, plus Grumpy's 1970 Camaro, and probably some Corvette Trans Am Cars
Early Yenko Blocks based on the Original ZL-1
Later Yenkos based on.........(to be filled in be an expert please [img]/ubbthreads/images/graemlins/dunno.gif[/img]

[img]/ubbthreads/images/graemlins/scholar.gif[/img]