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Old 07-28-2007, 04:12 PM
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Chevy SB oil pump bolt

Technical question. Somehow in all the switching of old and new parts, I managed to loose the oil pump bolt for my 350 Chevy SB. I know that I can order a new ARP oil pump stud kit, but I'm using a Melling HV pump and tried the bolt from the 97 motor I'm building and it is about 1/4" too long. Can I just go down to the hardware store and buy a 2" grade 8 bolt and washer to replace it or should I get teh ARP stud?

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Old 07-28-2007, 05:06 PM
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If it were me, I`d get the stud from the start. Also if you haven`t already, get the hardened steel drive rod for your oil pump as recommended. If your building a street machine, the high volume pump isn`t needed and will only eat more power to drive. A stock melling replacement oil pump with some mild porting work will do the job and won`t eat up so much power to drive.
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Old 07-28-2007, 05:15 PM
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yes, a grade 8 bolt will work fine, if you have head bolts lying around if IIRC the intermediat length head bolt works also.
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Old 07-28-2007, 05:34 PM
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Someone recently contributed a post concerning more or less stock rebuilds and using a HV/HP oil pump. I did a search, but did not find it.

The jist of it went like this: On a stock rebuild, the bearing clearances are fairly tight, thus the crank will not be slinging out any considerable amount of oil to splash lube the distributor gear. And that's ok with a stock pump that is not loading the gear too much. But with more load placed on the gear due to a HV/HP pump, the bearing clearances need to be looser to sling enough oil to prevent the additional load on the gear from eating itself up.

I thought the explanation made sense.
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Old 07-28-2007, 06:42 PM
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pil pump

OK, I can grasp that logic. The build is maybe more or less stock. Block bored 30 over, Scat crank and rods, Clevite CB336P rod bearings. Sealed Power .125 domed pistons, Crane 274 cam, Edelbrock Performer intake and 750 Edelbrock carb. It's going into the 35 you see pictured above which is in the process of a complete rebuild from frame up. I purchased a 350 rebuild kit from Northern Auto Parts and the tech recommended the Melling M55-HV pump and drive rod for this build. My formal education is in automotive tech (30 years ago). I've been out of the business for about 20 years and things have sure changed. Much more technical. Anyway Thanks for the replies to date. I'm going to go with the ARP set-up. I just feel more comfortable that way. Can't afford to have the oil pump rattle around in the pan.
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