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Discussion Starter · #1 ·
I used a one piece Felpro Permadry Plus blue oil pan gasket (part # OS34509T) on my new 350. Now I have a big rear oil leak. Has anyone ever used this gasket and if so how did it work for you? It seems like it would work great being a one piece silicone rubber. I put sealer on the 4 edges of the pan like the directions said to do. Not really sure if it's the pan or the rear main seal yet but have never used this gasket before. Is it any good? Thanks.
 

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I used a Felpro one piece on a mark four big block had no problem getting it to seal. Problem i encountered happened when i did a cam swap, the side rail gasket is thicker then cork used in conventional four piece set. Hence the new chain cover lower seal can not get enough crush to make a good seal. Lots of RTV and much patience can over come this as i learned the hard way. Something to consider.:yes:
 

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I have used one on two different small blocks and they both worked fine.
 

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Did you replace the rear main seal? did you put RTV between the two seals? if so that might be your area of the leak. The two piece seal does not require RTV between the halves, doing this will hold the seal halves apart, you should inslall it slightly lower about a 1/4 inch in the block and the opposite on the main cap. It also does require anarobic seal between the main cap and block. I've also used the felpro one piece without any leaks.
 

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Dont want to hi-jack this thread. But Ill be installing one tonight. Just wondering. Do you guys put sealer in 4 seperate corners. OR do you put a small bead the lenght of the contact between the timing cover/rear cap areas? (so their would be two long parts)

Also do you put sealer on both sides of the gasket (so on the block and on the pan)

Thanks
 

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Sealer is not required along the block and pan surface. I just put a dab in the 4 corners and let the pressure of the pan do it's job there. I also let it sit for 24 hours before putting any oil in and and dropping the engine back in the. The one I did the other night will be firing up tomorrow after I get done reattaching all the underneath stuff in the car.
 

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ditto
 

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One on my 406, little permatex at the corners, no issues
 

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I used one on my 400 sbc in my other 68 and one on a 454 in a GMC p/u, both worked great... no probs.
 

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Don't want to ruin the consistency of the thread and make your decision harder, but I used one a big-block and it leaked horribly. I went back to cork/rubber ends. A machine shop I use said they don't use them either. Maybe I did something wrong, but it was a very frustrating experience and I swore never to use another. I prefer threads that are consistent for decision making, but it was a very bad experience.
 

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Discussion Starter · #16 ·
Thanks for the honesty Bart. I am so frustrated with this oil leak. I was so careful to make sure I did everything right and BAM big leaky mess. I think it probably has something to do with the cheap chrome oil pan I bought on ebay and used on it. I finally got the front to stop leaking by literally hammering the front lip on the pan up and spreading a thick layer of silicone. It seems like the pan doesn't squish the front and rear portions of the gasket enough to seal it. Not sure what to blame, the pan or gasket. Just a big dang frustrating experience. I think that I'm going to try the hammering and silicone thing to the back of the pan too. Wish me luck.
 

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I think it probably has something to do with the cheap chrome oil pan I bought on ebay and used on it.
Got to watch that Ebay stuff....unless it is name brand, it will be offshore junk....bit me a few times.

I have the blue one piece on my sbc for over a year with no leaks...
 
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