66 427/425 oil pan I.D. help needed
I have been trying to search for discussion on identifying a correct oil pan for my current restoration project, 66 conv, 427/425. can I use the GM replacement and repo gussets, with minimal points loss or should I continue to search for the correct origional pan per the juging reference manual. Does the replacement pan have the center bolt theat goes into the timing chain cover?
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Re: 66 427/425 oil pan I.D. help needed
I would doubt that GM current service oil pan would have the center hole, as the reason for the bolt was eliminated in production on 21 Dec 1966 with the introduction of a new front seal. [quote] Chev Service News, May 1967: " ...the center bolt hole has been deleted and replaced with a rubber protrusion (front cover surface) which is inserted into the front cover flange. The center bolt which attached through the oil pan flange has been removed". In my mind, it's not 100% clear whether the deleted hole they refer to is in the pan or the new front seal.Last edited by Wayne M.; January 3, 2013, 02:23 PM. -
Re: 66 427/425 oil pan I.D. help needed
William/Wayne, we have used the service GM pan with very slight mods. I cannot remember if the hole is there or we drilled one, and #2, use JB Weld or something similar to fill the stamped GM part number in the pan.Dick WhittingtonComment
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Re: 66 427/425 oil pan I.D. help needed
My car was built on 12/21/65, engine built before that so I would assume I need the bolt hole and bolt, but what pan should I use, the GM replacement, add the gussetts, fill the stamped part #, and it will judge correct?Comment
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Re: 66 427/425 oil pan I.D. help needed
Does your timing cover have the center hole? I would get a service pan and put the corner gussets on. And fill in any numbers you find. The one my dad used for his 67 only had a sticker with the part numberComment
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Re: 66 427/425 oil pan I.D. help needed
My timing cover does not have the hole and welded nut. It has the origional block, heads, intake, but someone has installed an incorrect timing cover and panComment
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Re: 66 427/425 oil pan I.D. help needed
William-----
I would use the current GM SERVICE pan with added corner reinforcements. As far as the hole in the front oil pan gasket radius is concerned, the SERVICE pan does not have it. Not much of a problem: if you need it, drill it. If the pan has a part number stamped on the bottom, obliterate it as Dick describes. Will this get you 100% of the way to full points? I don't know. There may be some other nuance which someone deems distinguishes an original from the current pan but none that I know of.
One thing I know for certain is this: the current pan is NEW. You can look for a long time for a "correct", "original" pan, if you're lucky find one, and pay big $$$$ for it. What you'll have in the vast majority of cases is a WELL USED pan which may have dents and/or DISTORTIONS. If distorted, it will leak. Why go through all this and end up with this result? One of these days when the current GM SERVICE pan goes into history you're going to be surprised at just how precious these things are going to become. For example, for years all sorts of folks "looked down their noses" at the 57-62 SERVICE pan, GM #359937. Try to find one now and note what they sell for.
As far as the front cover goes, if you want one of original configuration and with the bottom hole and weld nut, you'll have to find a decent used one. There's really no other option. NOS will be as difficult to find as hen's teeth.In Appreciation of John HinckleyComment
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Re: 66 427/425 oil pan I.D. help needed
Joe, can you give the correct # for the gm replacement pan? Thanks, BillComment
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