Yenko aluminum block

[Charley Lillard]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: black69</div><div class="ubbcode-body">Here is a ZL-1 block that is similar to the one I have, and has similar attributes to what is described in this thread.

I will be watching it to see where it ends up. With that casting number, it can be considered for use as is in FAST/purestock drags, as an FYI.

http://www.ebay.com/itm/1969-ZL-1-ALUMIN...=item256bded370 </div></div>

I think this is the first time I have ever seen somebody use grade 8 bolts on a intake manifold.

[COPO_Anders]

I assume the ZL-1 blocks in this thread are of the same type as the ones put in the 1969 ZL-1 Camaros at the factory. That is, they where not beefed up like the Yenko-blocks from the last half of the seventies that could take more pounding, right ?

[img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

[black69]

I think each guy (Ed Cunneen, Bill Porterfield, Mark Gillespie) have the collective key info on these blocks. Each one has graciously helped me on mine. Mark has the records of when built based on unique stampings. I believe he is close to releasing a new book on the yenko Zl-1 engines themselves.

I came away with they are identical to the original 69 casting except for the area of the freeze plugs and foundry, and lack of casting dates. There was a lot of colorful activity on how many were made through Don Yenko (which have traceability to his records) and some that do not. Do not assume all of these came through Don's shop.

[bergy]

I know that we &quot;lost&quot; some at Tonawanda. The regular production block took 9 cores - the aluminum version took 11 cores. You can see the progression of casting runs by looking at the grind marks. The first block in Charlie's post has a big &quot;flow off&quot; scar to the right of the WP outlet. The other casting run eliminates this flow off.

[ban617]

Hi what do the Yenko blocks sell for ?fair price ? The guy said it has Yenko casted into it ? I know the condition will be everything .. As long as it hasn't been busted half way threw the mains ...Thanks