ZL-1 engine questions

[William]

Not quite. It states as of June 6 Chevrolet would no longer accept a dealer order for a Z/28 with a 4.10 axle. The order lead time was about 4 weeks. So 07A and later builds would have nothing numerically higher than 3.73. That's around VIN N665xxx.

Must have been too many splattered 302s with 4.10 axles. Didn't stop it though as a salesman friend fried the engine in his '69 Z/28 demo with 3.73s.

[Kurt S]

Strange to believe, but the data backs it up. No late Z's with 4.10's.

[black69]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: x77-69z28</div><div class="ubbcode-body">the vin would be stamped above the oil filter. the back of the engine would have a casting number. the assembly date would be stamped on the front pad unless the block was decked. </div></div>

Not all ZL-1s had the partial VIN at the oil filter.

In those days steel main caps could not be fully processed with the block. They and the block were stamped with a sequence number to ensure they were assembled to the same block. The block was stamped center rear.


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I talked with the guy I bought the engine from, and he said the numbers he saw were on the opposite side of the casting number in the back (top). He said he did not look over by the oil filter. He said it looked like a nice row of fine numbers, so I bet it was a sequence. This engine did come out of a town that took delivery of a 69 ZL1 in colorado, so who knows. can't wait to get it home.