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Old 03-02-2006, 07:44 AM
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Oil Pump Bolt

What's the size of the bolt used to bolt the oil pump on the block for a chevy 350 engine?

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Old 03-02-2006, 08:05 AM
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3/8thsX16......... I'm not Sure of the Length,....... 1 1/2" I Think........
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Old 03-02-2006, 08:39 AM
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Length is 2 3/16" on a 327 which should be the same
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Old 03-02-2006, 11:37 AM
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That's what i grabbed to try. So at least i ain't lost my mind.
Thanks for a quick response!
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Old 03-02-2006, 11:49 AM
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Quote:
Originally Posted by scbauml
That's what i grabbed to try. So at least i ain't lost my mind.
Thanks for a quick response!
You are lucky I had an engine on a stand with the pan off so I could pull the bolt and measure it!
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Old 03-02-2006, 03:58 PM
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I am pretty sure that is a 7/16 bolt.
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Old 03-02-2006, 04:24 PM
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Therer are 2 different bolt lengths for the SBC oil pump bolt (7/16" diameter, coarse thread), 2" and 2 3/8". Don't use a short SBC head bolt!

tom
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Old 03-02-2006, 06:46 PM
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bolt sizes

divide the head size by 3 and multply by 2. If its and indust. bolt subtract 1/8 before diven. 3/4 head*3=1/4x2=1/2
7/8-1/8=3/4*3=1/4x2=1/2 on indus.
read the tool and rember where the cali. is .
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Old 03-02-2006, 07:49 PM
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Quote:
Originally Posted by machine shop tom
Therer are 2 different bolt lengths for the SBC oil pump bolt (7/16" diameter, coarse thread), 2" and 2 3/8". Don't use a short SBC head bolt!

tom
My example came from an engine I didn't assemble last time so who knows if it is right.
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Old 03-03-2006, 05:35 AM
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bolt sizes

Well I still don't understand how a 3/8 bolt in a 7/16 hole could hold an oil pump on?
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Old 03-03-2006, 06:00 AM
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Quote:
Originally Posted by machine shop tom
Therer are 2 different bolt lengths for the SBC oil pump bolt (7/16" diameter, coarse thread), 2" and 2 3/8". Don't use a short SBC head bolt!

tom
Read Tom's post, it pretty much covers it all.
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Old 03-03-2006, 06:05 AM
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Son of a buck

That's what i tried and apparantly the dang thing is stripped. This is the only thing keeping me from finishing this project. Any thoughts.
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Old 03-03-2006, 06:32 AM
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its more than likely a 7/16 x 14 bolt... from what it seems, ur trying to use a 3/8 x 16... try a bigger bolt
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Old 03-03-2006, 06:33 AM
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The bolt is stripped or the cap?

If it's the cap is it all the threads or just the first few? If it's just the first few then you need a longer bolt just make sure you don't go too far and bottom out the bolt which leads to a loose leaky pump.
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Old 03-03-2006, 06:59 AM
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If you use too long of a bolt it could hit the back of the main bearing. That would cause a major engine failure for sure. If you can't find the right bolt ARP has them and the local speed shop should have it.
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