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Old 11-10-2007, 10:21 PM   #1
5150
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Oil Pan bolt sizes?

Tomorrow I'll be putting my engine back together, but I apparently have lost my oil pan bolts. Anybody know what size they are. I know the front two are obviously bigger. Thanks.
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Old 11-10-2007, 11:41 PM   #2
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Re: Oil Pan bolt sizes?

Nope, but ttt for ya -
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Old 11-10-2007, 11:53 PM   #3
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Re: Oil Pan bolt sizes?

The front and rear two have 1/2" heads and the rest are 3/8" heads, but I'm not sure of the thread pitch and length. This probably won't help you at all but I thought I'd throw it out there.
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Old 11-11-2007, 12:10 AM   #4
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Re: Oil Pan bolt sizes?

The smaller bolts are 1/4 inch course thread,about 1/2 inch long,the 4 corners are 5/16 course thread about 3/4 of an inch long!!!!!!!!!!!!
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Old 11-11-2007, 07:56 AM   #5
Tx Firefighter
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Re: Oil Pan bolt sizes?

Brian is 100 percent correct.

As a general rule,

If a 9/16 socket fits the bolt, it's 3/8 size.

If a 1/2 socket fits the bolt, it's 5/16 size.

If a 7/16 inch socket fits the bolt it's 1/4 size.

That's for all basic bolts you'll encounter working on stuff.
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Old 11-11-2007, 07:59 AM   #6
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Re: Oil Pan bolt sizes?

Thanks Brian and Kevin, I have one of the fronts, I had them in a ziploc bag and was looking for them to clean them up. I'll go get new ones now!!
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Old 11-11-2007, 08:13 AM   #7
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Re: Oil Pan bolt sizes?

I'm not sure on those sizes ??? I just put my oil pan on last night with all new ss bolts. I have a 1990 sbc 350. (14) 1/4"-20 bolts (2) 5/16"-20 and 2 studs with nuts on them. The older motors probably don't have the studs, most likely 2 more 5/16". If you have a big block then it maybe alltogether different.

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Old 11-11-2007, 08:17 AM   #8
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Re: Oil Pan bolt sizes?

If you're buying new bolts, get an extra 10 of the 1/4 inch ones for your timing cover. They are the same.
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