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Forum: Pontiac - Race 11-28-2022, 02:21 AM
Replies: 8
Views: 1,266
Posted By Stuart
For 1966, the low compression heads were casting...

For 1966, the low compression heads were casting 091. They bought the compression down to 7.6 or 8.6 to 1 depending on the particular engine. There were different casting numbers for other years;...
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