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tubman · 10-16-2019, 07:34 PM

Unless there's a problem with the block, I'd do the .125 overbore. Even with that, there are probably at least 3 more "clean-up" bores left in the block. After that, it can be sleeved. Think about it; the 14 ci increase in displacement is over 5%. I would expect that you should be able to see that much difference. It's kinda like when Chevrolet increased the 265 to 283 and you know what that meant.

You are considering putting a modified 59A in a '33 Ford; that makes you a "Hot Rodder". This is what we do; look for every bit of HP we can find.

I just saw your last post, which to me makes the decision easy. Unless you are planning to use some pre-war rings, the 3 ring pistons are a "no-brainer", as they will decrease friction, plus provide an increase in displacement. On my last engine, a 258" with a stock stroke and a .125 overbore, I left out the bottom rings after a lot of back and forth here. It was the correct decision.

10-16-2019, 07:34 PM	#4
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,302	Re: block quandary Unless there's a problem with the block, I'd do the .125 overbore. Even with that, there are probably at least 3 more "clean-up" bores left in the block. After that, it can be sleeved. Think about it; the 14 ci increase in displacement is over 5%. I would expect that you should be able to see that much difference. It's kinda like when Chevrolet increased the 265 to 283 and you know what that meant. You are considering putting a modified 59A in a '33 Ford; that makes you a "Hot Rodder". This is what we do; look for every bit of HP we can find. I just saw your last post, which to me makes the decision easy. Unless you are planning to use some pre-war rings, the 3 ring pistons are a "no-brainer", as they will decrease friction, plus provide an increase in displacement. On my last engine, a 258" with a stock stroke and a .125 overbore, I left out the bottom rings after a lot of back and forth here. It was the correct decision. Last edited by tubman; 10-16-2019 at 08:06 PM. Reason: 14 "ci" not "%"