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rotorwrench · 09-19-2014, 11:14 AM

If you want to bore one from standard all the way out to max, you will lose a lot of potential use of the block. If you are already at 3 5/16" then that is a good size for a hot rod. A person can go to sleeves though and use larger if you have a mind to. It just depends on how much you want to spend and how long you want it to last.

09-19-2014, 11:14 AM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,010	Re: Flathead Bore Size ? If you want to bore one from standard all the way out to max, you will lose a lot of potential use of the block. If you are already at 3 5/16" then that is a good size for a hot rod. A person can go to sleeves though and use larger if you have a mind to. It just depends on how much you want to spend and how long you want it to last.