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#1
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The actual pins and and then the big ends of the rods were more of an issue than the mains in 1967, weren't they?
If you're gonna get busted for something it would have to be going out of spec in prepping the early rods.
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#2
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I have a 327 that was built in the 1970's with the Summers Brother splayed billet four bolt mains.
There was a lot of development done on 301 Chevy racing engines before 1967 and was not hard to do a 4 bolt main conversion |
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