5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

boring block 40 over?

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03-15-2006, 11:27 PM

#1

black89gt

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boring block 40 over?

when i bore the block 40 over, do i need new pistons and rings? and what size will it be? like a 306 or 307?

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03-15-2006, 11:36 PM

#2

silver91gt

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RE: boring block 40 over?

yes you will need new pistons and rings.

it will be a 308 CI (307.8)

a 306 is bored 0.030

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