[Dragncar]

Originally Posted by Rocky Rotella

Grandam1979, can you attach some pictures of the new SR block? And are the numbers cast or stamped? I'd love to add them to my collection.

Concerning the numbers, as Johnta1 pointed out, I've been tracking SR blocks for years. While they're certainly not rare, there aren't as many out there as people might expect.

What I can tell you is that I can no correlation to the sequence following "SR8" (which signified Service Replacement 8-cylinder). Most are higher than those produced during the preceding calendar year, but some are lower. Some produced in the same model year may be 10,000 units off. I don't know that Pontiac kept any specific record of them.

I supposed the bigger question is, how many warranty failures did Pontiac have that required a new fitted block (block, main caps, and pistons) each year? If I had to guess, I'd say it's a relatively low number. And combine that with the sheer number of fitted blocks Pontiac sold over the parts counter to racers, the SR blocks that are out there, not all were destined for warranty repair.

If anyone has any other insight on the sequencing (or paperwork that clarifies it), I'd be interested in learning more!

Whitmore told me the 1970 10-1 455 with 64 heads ( I have one) had a fair amount of comebacks due to people not running premium fuel. It had cast pistons and they cracked and took out a few engines. He was a dealer mechanic back in the day.