Oil Pan Gasket Question

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jonn6464

1970 Duster
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Hey FABO,

I need to order an oil pan gasket for a 318 with a truck style pan.

Fel-Pro has 2 part numbers, both with the exact same description.
upload_2021-10-2_23-50-46.png


Does anyone know what the difference is between these two sets? Obviously, it appears one has a smaller rubber end piece. But, why?

I called Fel-Pro... their answer was "one has a thin end rubber and one has a thick end rubber".

Here they are...

Fel-Pro OS6566C-2
upload_2021-10-2_23-47-27.png


Fel-Pro OS6566C-3
upload_2021-10-2_23-48-34.png



Thank you
 
Hey FABO,

I need to order an oil pan gasket for a 318 with a truck style pan.

Fel-Pro has 2 part numbers, both with the exact same description.
View attachment 1715800023

Does anyone know what the difference is between these two sets? Obviously, it appears one has a smaller rubber end piece. But, why?

I called Fel-Pro... their answer was "one has a thin end rubber and one has a thick end rubber".

Here they are...

Fel-Pro OS6566C-2
View attachment 1715800021

Fel-Pro OS6566C-3
View attachment 1715800022


Thank you
318/360
 
Just use gasket-in-a-tube: silicon. Been doing it for 30 yrs, no problems.
 
The top pic is for a 273-318-340, the bottom pic is for a 360...

Just like Roy said... :thumbsup:
 
The top pic is for a 273-318-340, the bottom pic is for a 360...

Just like Roy said... :thumbsup:
Did the front oil pan gaskets change on the 273? On my '65 273, the front rubber gasket seems to have little fingers or tabs that go through the oil pan to secure the gasket. I don't see those on the OP first pic.
 
Just use gasket-in-a-tube: silicon. Been doing it for 30 yrs, no problems.
Do you use the rubber ends or not? I've seen it done both ways. I've used RTV on the sides before but never the ends.
 
Do you use the rubber ends or not? I've seen it done both ways. I've used RTV on the sides before but never the ends.
I did use the rubber ends. There is way too much gap on the ends for me to feel comfortable with not using the rubbers.

I am having a real problem keeping the front rubber from popping out on one side or the other, once I get down to the final bit of tightening.

I'm working on a solution now.
 
I did use the rubber ends. There is way too much gap on the ends for me to feel comfortable with not using the rubbers.

I am having a real problem keeping the front rubber from popping out on one side or the other, once I get down to the final bit of tightening.

I'm working on a solution now.
Yeah. I've seen people fill up the grooves in the ends with RTV before. That's a LOT of RTV. It'll surely work if you put enough in to seal, but damn, that stuff gets expensive. lol
 
The way I keep the end seals from squeezing out is I use 3M weather strip adhesive , (the yellow Gorilla snot) on the bottom side of the end seals, let it dry then use RTV on the top side. RTV acts as a lubricant until it drys. So when you apply pressure it squeezes out or in.
 
Did the front oil pan gaskets change on the 273? On my '65 273, the front rubber gasket seems to have little fingers or tabs that go through the oil pan to secure the gasket. I don't see those on the OP first pic.


Yes, they changed the gaskets for the front and rear in late 60's or 1970 for sure...

The 60's style pan takes a gasket with 6 tabs/nipples, where the later one only has 2 tabs/nipples and a large flange on both sides...

The one in the first pic is the later style...
 
RRR,
I use sil in place of the rubber ends. Rarely use gaskets any place, except for head, intake, valve cover & header gaskets. Everything else gets sil with nothing else. Been doing it for years, zero problems. I always carefully clean the surfaces, roughen up slightly with emery or wire brush. Final clean with lacquer thinners.
 
RRR,
I use sil in place of the rubber ends. Rarely use gaskets any place, except for head, intake, valve cover & header gaskets. Everything else gets sil with nothing else. Been doing it for years, zero problems. I always carefully clean the surfaces, roughen up slightly with emery or wire brush. Final clean with lacquer thinners.
Oh, I'm sure it works well. But that takes a lot of RTV, doesn't it? Couple tubes for the whole oil pan. lol
 
RRR,
I buy the cartridges that require the cartridge gun. That one cartridge will last 2-3 engines. I find the cartridge gives you more control of the silicon feed. I always assemble with silicon before it skins. So you only have 10-15 min working time. You have have everything ready to go & in place.
 
RRR,
I buy the cartridges that require the cartridge gun. That one cartridge will last 2-3 engines. I find the cartridge gives you more control of the silicon feed. I always assemble with silicon before it skins. So you only have 10-15 min working time. You have have everything ready to go & in place.

That sounds like it works pretty good. I've often wondered, if you applied a good even bead and let it cure on the block completely, if it would act like an o-ring and allow removal later without disturbing the RTV. I've never tried it. All I've ever done a few times is replace the side cork strips with RTV and that works pretty good. I may try the RTV tube method you describe and see how it works.
 
I am sure you will be pleased [ no leaks ].
I view sil as two products in one. In it's 'fluid' state, it acts like an adhesive that sticks to everything. Then when it cures, it acts like a sealer to seal a gap.
 
I am sure you will be pleased [ no leaks ].
I view sil as two products in one. In it's 'fluid' state, it acts like an adhesive that sticks to everything. Then when it cures, it acts like a sealer to seal a gap.
Exactly! It also has a third usage. It acts as an anti seize agent as well, yet, so many people slap argue it down like they think you're slobberin it all over God's creation, plus they complain about how "hard" it is to clean up! Seriously? lol I have to reseal the oil pan on Vixen's engine soon and since I'm pulling the engine, I also plan on refreshing the crank bearings, so I'll give the total RTV treatment a whirl. LOL
 
Yes, they changed the gaskets for the front and rear in late 60's or 1970 for sure...

The 60's style pan takes a gasket with 6 tabs/nipples, where the later one only has 2 tabs/nipples and a large flange on both sides...

The one in the first pic is the later style...

Anyone know if the early oil pan gasket with the 6 nipples / tabs is available? If yes, part # and from where?
 
Anyone know if the early oil pan gasket with the 6 nipples / tabs is available? If yes, part # and from where?


It should still be...

Try telling them you have a 68 273, 318, or 340; that's one year they had the 6 nipple gasket on the oil pans...

It should be Fel-Pro 20-1805...

DSC05992 B1.JPG


DSC05993 B2.JPG


DSC05994 C B3.jpg


DSC05995 C B5.jpg
 
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