[black69]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JoeC</div><div class="ubbcode-body">Yenko was given permission by Chevy on Aug 1, 1974, to purchase ZL1 blocks from Winters Foundry.

Before that, they were bought through Chevy </div></div>

My block is obviously before this 1974 arrangement, and is from the laporte foundry. To me it is possible, those drag cars making the times before 1974, were reinforced 052 blocks made by yenko (like the one I have). Thats my thought for the day.
Why the yenko stamping are hidden behind the timing cover is interesting also. Why did he do that....
From the outside it looks for the most part as a 052 standard block.