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theman440 11-29-2017 02:40 PM

Cylinder wall thickness
A question for the engine builders here on CR - What would be a minimum cyl wall thickness you would want to see? The block is a factory Mopar 440 for a bracket car shootin for 700-750 hp.

Thank you

GTX JOHN 12-01-2017 04:46 AM

Re: Cylinder wall thickness
I would want .175 or more at finished overbore in a big block mopar or .135 in small block mopar.

theman440 12-01-2017 07:16 PM

Re: Cylinder wall thickness
Thanks John,

Are you back in town? - you happen to have a sonic checker? call me I still need some wheels.

Paul Precht 12-21-2017 10:45 PM

Re: Cylinder wall thickness
The only blocks that are that are thick are the 413 industrial and motorhome, most 440s are less than .175" before boring and 700HP would be about the safe limit IMO. The aftermarket blocks are the way to go if you can get one. The 400 blocks are a bit stronger in the web area and more rigid due to the shorter cylinder length. A 400 block filled Halco machine grout and Pro-Gram Engineering main caps would be a good start.

JMan 12-28-2017 07:52 AM

Re: Cylinder wall thickness
There were some thick blocks in 67-69 era. Back when I was more adventurous, we took some old blocks, filled them, bored/honed to 4.560 and put a 4.625 stroke to make an alcohol 604" It required a main girdle and good caps to hold things since the cylinder walls were at .060" +/- a little.
They didn't stay round very long as one might expect. That was back around 1990 and the only aftermarket blocks were KB. Thought it was worth a try. It wasn't.

GTX JOHN 01-01-2018 10:35 PM

Re: Cylinder wall thickness
We have seen thick and thin blocks......No matter what year
the 440 blocks are. Just have to check them.

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