Thread: 396 bore over
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09-26-2007 02:34 AM #1
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396 bore over
Can A 396 big block be bored over to 427-454 bore size? the bore on a 396 is 4.094 and 427-454 bore is 4.250, is the cylinder wall thick enough?
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09-26-2007 06:40 AM #2
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No It can not be bore that much. the casting will be to thin.
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09-26-2007 06:43 AM #3
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If you have any question about wall thickness have the block sonic tested.
Originally Posted by vortec king
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09-26-2007 02:51 PM #4
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In street or prolonged use I doubt it would last. Buttttt I did get away with it in a circle track alky motor several years ago,had no other choice at the time and it lasted a season and half before it got a hairline crack in one cylinder.
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Everything got swapped over, had to build a bracket for the fuel pressure regulator, modify the throttle cable bracket, rebuild some fuel lines, pull the screen wiring and mount the new one. So far...
New guy from Utah.