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Old 05-09-2004, 12:09 PM
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high volume or high pressure pump?

i just put in my .001 bigger main bearings in my 350 chebby. that's what my brain child machinist said to do. i torqued them down with assembly lube on the bottom half of the bearings. i just plasti-gaged them and have .003 on the thrust and a middle bearing and .002 on all the others. the .002 is fine and w/in spec (.001-.025) but the .003 is .5 thous over. wondering if because of this i should run a high volume oil pump? virtually stock engine (9.2-1; .469 lift). crank wasnt turned. --(this isnt my 400 bob)

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Old 05-09-2004, 01:35 PM
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The right ting to do would be change the big bearing to bring it within spec. .003 isn't a huge concern with a street ride. I don't think you need a higher pressure pump but you can flat sand or mill the pump cover to decrease the oil pump gear clearance and gain a little more pressure with hot oil without incurring the penalty of horse power loss or extra strain on the oiling system.
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Old 05-09-2004, 05:22 PM
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I don't like the idea, but you could bring your bearings in spec by giving the caps a couple of careful cuts with a mill-bastard file.

For reference, this was recommended to me by a machinist for a slightly loose (fresh machining, new bearings) rod bearing I had. It worked. The engine takes a beating and keeps going.

Filing a main cap is nasty since you would probably make the alignment worse than it may have already been.
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Old 05-09-2004, 06:19 PM
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im all for battlefield fixes like that. i went with std size rod bearings and didnt have the crank turned. it miked out okay but i know it's on the high side for the rod bearings as well.


found an auto parts store with a machine shop that's getting me a new oversized bearing today by the time i get off work, so i will have everything up to par. yea!!! cause i just found out my wife gotta bunch of money so we'll be keeping our camaro after it's all done!

Last edited by bullheimer; 05-10-2004 at 11:27 AM.
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