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Old 04-30-2011, 09:54 PM
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supercharged 427td

I just started a 427 td project. Im planning on supercharging it with an
F-1A procharger but im not sure how far to go with the overbore. How much is too much?

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Old 04-30-2011, 10:08 PM
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I think most of 'em will take 0.125" and pretty much all of them will take 0.100". If I were supercharging one though, I'd cut it the least amount that would clean up the walls. With a blower, you don't need more cubic inches. You just change pulleys.
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Old 04-30-2011, 10:12 PM
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Well you asked....when you hit the water jacket!! Now seriously, as little as possible with a blower motor. First take the block to the machinist and have it mic'd, maybe it's already .030 .060 who knows. That will give you a heads up on weather that block will be useable for your application or not. Also, do a lot of reading and research on blown applications.
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Old 04-30-2011, 10:18 PM
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The block is in very good shape. It had really good green antifreeze in it and, knowing the guy I bought it from, it was taken very good care of. I know it has been rebuilt at least once. The rods are stamped and it has a steel 396 crank in it.
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