ZL-1 block versus Can-Am block?

[Grumpy's Toy VIII]

Carleen, agreed Reynolds prototype for GM. I have worked with and documented 21 variations of the GM aluminum blocks.

The 0-326711 you mentioned is definitely Can Am only. I have seen none with provisions for a mechanical fuel pump and agreed that mold was 68 only. It is also 4.440 bore and does have sleeves.

Who did you hear the production run number from ? That is interesting, I have never heard a definitive count other than from Bill Jenkins and Smokey Yunick who both state 70 short blocks cast between 67-69. This is Reynolds casting, not Winters. Different block, yes, even those that share the identical mold numbers:
3946052 and 3946053.

The Reynolds and Winters were cast from different alloys.

However, GM did turnover casting 052, 053 and 040 to Winters for '70 and '71 with big bore molds for Can Am teams.

If your into the Can Am stuff we should compare notes. A small group of us here in the USA that work on these are comparing notes to combine all this data and get it to those who restore these engines.