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Grady,
Based on response versus rpm, I am betting that it has 8.5:1 pistons. Since the case has no numbers it must be a factory replacement. The question I have is what case it might be, either magnesium or aluminum. I am hoping it has an early 3.0 SC engine case but since there are no numbers I am in the dark. It was a California car so required all the pollution equipment be replaced after the rebuild so the case options must be limited. The repair receipts I have date from 1993. I am guessing a mechanic in 1993 would have used a 3.0 SC case rather than a new 2.7 case. Would a factory replacement 2.7 case have even been available then? A flame test on a shaving should answer the magnesium question. Does Wayne's engine rebuilding book have the different engine cases shown in photographs for comparison? Zimmerman's book does not nor does Wayne's 101 Projects book. There must be differences in casting web patterns from one engine model to the next. I will solve this puzzle eventually. Thanks for your input.
Al
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