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#1
12-06-2022, 02:29 PM
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Great stuff from someone who was there!
Any idea why there were two casting numbers for the same block? The production ZL-1 block had two numbers; no differences noted. One of the earliest cars had an 053 block.
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Learning more and more about less and less... 
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#2
12-06-2022, 04:43 PM
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Quote:
K
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.56 @ 139 mph best
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| The Following User Says Thank You to Keith Seymore For This Useful Post: | ||
dustinm (12-06-2022) | ||
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#3
12-06-2022, 06:20 PM
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Bergy - Thank you for your personal experience and insight into the foundry operation...awesome info!
Aside from the casting core variations, could you comment on M-coded blocks, (instead of the traditional casting date). Specifically, what types of changes would dictate creating M-coded blocks and typically how many were run for evaluation? I've been fortunate (unfortunate??) to have had two M-coded 010 blocks...one in a 70 Z28 and one in a '72 Z28.
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Steve Nuwer 1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored 1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project. 1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project 1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD) www.2ndGenZ.com
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