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Old 11-13-2019, 05:26 PM   #1
msg
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Clearance specs for a 350 casting # 3970010 2 bolt?

I am looking for a resource for the 350 I have that gives main and rod bearing clearance specs needed for a rebuild. I have an engine that I pulled and stored a few years and with the help of a friend we were going to use some plati gauges and see where things are with this engine as we go through it.

Anyone have a resource for specs on this engine?

So far Ive found this

http://www.v8s-series.freeservers.com/sbc.htm
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Old 11-13-2019, 05:46 PM   #2
geezer#99
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Re: Clearance specs for a 350 casting # 3970010 2 bolt?

Lots of common specs there but nothing specific.
Try this link.

https://www.enginelabs.com/engine-te...ng-clearances/
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Old 11-13-2019, 06:00 PM   #3
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Re: Clearance specs for a 350 casting # 3970010 2 bolt?

The standard spec for a stock 350 Chev is .0025". I'm happy with anything between .002 and .003. My last one in my truck was at .003 and I debated if it was too much but my oil pressure is always too high for my liking. I guess my engine must have a high performance oil pump but I can't tell by looking at them.
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Old 11-14-2019, 12:17 PM   #4
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Re: Clearance specs for a 350 casting # 3970010 2 bolt?

That casting number is the most common 4" bore block that GM ever made.

Depending on your use, the clearance could change. High performance and racing engines usually use clearances a little loose to compensate for higher oil volume and pressures. For a stock rebuild I shoot for between .002 and .003, trying to get right around .0025.

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