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B20 block identification 140-160

posted by  Phil S. on  Thu Jun 23 12:06 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

I'd say so far it's looking like they're all the same castings regardless of what crank went into them. I really went through my two sets of detailed pictures and couldn't find any visible differences between 6- and 8-bolt blocks, except for the markings on the bearing caps, which may not be a reliable identifier.

The block we just sonic tested seems to be marginally thicker than the ones you're looking at, but not significantly.

What the minimum thickness needs to be is a different subject, but there are known high-mile 93mm street motors that don't suffer from blowby, and a whole bunch of 92mm kits that don't either. (I did say street motors...)






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