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Old 11-29-2017, 01:40 PM   #1
theman440
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Default 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.

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Old 12-01-2017, 03:46 AM   #2
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Default Re: Cylinder wall thickness

I would want .175 or more at finished overbore in a big block mopar or .135 in small block mopar.
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Old 12-01-2017, 06:16 PM   #3
theman440
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Default 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.
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Old 12-21-2017, 09:45 PM   #4
Paul Precht
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Default 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.
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Old 12-28-2017, 06:52 AM   #5
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Default 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.
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Old 01-01-2018, 09:35 PM   #6
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Default 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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