Yenko aluminum block

[Carleen]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bergy</div><div class="ubbcode-body">This old thread was linked on another site recently &amp; it really brought back memories. We made the cores for these blocks at the Chevrolet Tonawanda Foundry &amp; sent the pattern equipment over to Lockport for aluminum casting. Then the blocks came back to Tonawanda for machining on a special CNC machine that was located up by the doors leading to the main offices. The machine was very advanced at that time &amp; the tolerances were much closer then the regular production equipment. The whole operation had to be quarantined because the aluminum machining chips couldn't get into the regular production chips (aluminum causes pin holes to occur in cast iron). I realize that the ZL-1 option was very expensice, but these blocks cost Chevrolet a fortune to produce! Also, theft was a problem - another whole story! My recollection is that the CNC machine was still in place at least through 1978. </div></div>

Bergy, did Yenko end up whith thise LC Blocks later or was it sold over the counter?

[bergy]

Niclas - I believe that that set of equipment came off of the Ramboudi around 1968. It's been a long time, so I could be mistaken. The &quot;LC&quot; part is just formed by a small set core &amp; could easily be changed to accommodate any casting facility. The &quot;no casting date&quot; part confuses my a little - makes me believe that these were early blocks.

[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