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#21
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Re: Rubber Rear Main Seal
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Under "Item Specifics" of the Ebay listing it gives a manufacturer part number of RS29025 which is ROL brand. The interchange that they list is BS30136 (Felpro) and JV723P (Victor). I recognized these as the Ford V8 260, 289, 302 ci rear main seal. I have a BS30136 on the shelf so I thought I would compare. Here's what I found. The Ford is much larger over all, however it has a thinner width .230" compared to the GMC seal which has a .290" width. FYI. The old Victor part number for the rubber seal is JV616. I looked back in my Victor catalogs and this Part number doesn't appear until 1973. It appears prior to 1973 only the rope (Victor p/n JV716) was available, but the rubber should work retroactively for earlier engines. |
The Following User Says Thank You to OlsonsGaskets For This Useful Post: | ||
BobBray (August 11th, 2024) |
#22
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Re: Rubber Rear Main Seal
What you say makes sense, when I rebuilt my 351 20 years ago I bought a FelPro full gasket set, and it included a 2 piece rubber lip seal and the wedge type soak in oil side seals. I do have a later issue FelPro BS40048 and it's a rope seal with pipe cleaners and a small tube of silicone.
As far as the round rubber plugs are concerned, all they really do is provide a smooth surface for the oil pan gasket where it goes over the holes for the rear main bearing cap bolts. The concave side goes towards the bolt heads, my guess is they made them like that because the bolt heads are not exact so the plugs would conform a bit to be the right height. I think you would be fine making the plugs flat, it they are a bit too low add a bit of silicone, if too high just shave them off with a razor blade. Thanks for making the effort to furnish gaskets and seals for these old engines! |
#23
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Re: Rubber Rear Main Seal
[QUOTE=OlsonsGaskets;78214]Had a little time today to look into this Ebay posting. Looks like I was a little too hasty in my previous post. I sincerely doubt this will work (see picture for comparison).
I actually bought that from eBay that posted to try it out , i pulled out my original one in my 401 this morning it was a rubber one and it's stamped GMC on it. I should have taken a picture to compare the two before I installed it and match it up to this one from eBay and it's exactly the same. I installed it this morning. Fit perfectly! |
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OlsonsGaskets (August 12th, 2024) |
#24
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Re: Rubber Rear Main Seal
Quote:
Last edited by 63gmc4x4; August 11th, 2024 at 08:43 AM. |
The Following 2 Users Say Thank You to 63gmc4x4 For This Useful Post: | ||
OlsonsGaskets (August 12th, 2024), Prowbar (August 11th, 2024) |
#25
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Re: Rubber Rear Main Seal
[QUOTE=63gmc4x4;78220]
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@Olsonsgaskets I believe the plugs is concave to clear the 12 point bolt head. Suppose you could make them a little shorter to cut down production costs. If you need any measurements of the NOS rubber seal (17091) that I posted pictures of, contact me. |
The Following User Says Thank You to Prowbar For This Useful Post: | ||
OlsonsGaskets (August 12th, 2024) |
#26
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Re: Rubber Rear Main Seal
[QUOTE=Prowbar;78222]
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The Following User Says Thank You to 63gmc4x4 For This Useful Post: | ||
Prowbar (August 12th, 2024) |
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