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The 30's and 31's were kind of a factory balanced and blueprinted engine, as much as could be done in that setting. That, with the OAInduction made them pretty good performers.
According to my parts book, there was a difference between a 68 -69 400 short block with OAI, and one that was a Hi comp engine with OAI. 230824 was the hi comp 230822 was the exc hi comp 69 W-32 camshaft was a different part number 393859 69 W-30 " 402569 |
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