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| bam | LT1 oil pan gasket differences FYI | ||
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Senior Guru
 
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Last spring I did a hot cam swap and ordered an oil pan gasket Victor Renz OS32496B (it is tied to GM part #8101086760 in the catalog) When I tried to install it (under my 93 vett, motor still in the car) it didn't look right. It started to leak immediately (yes I properly torqued all bolts). After about a month I pulled it off and covered the whole gasket, both sides with the "right stuff" and re installed. I was fine for about a month then began leaking again. This winter I rebuilt my whole motor and ordered a GM gasket # 8101086760. When installing it I noticed how the fit was much better than the Victor Renz gasket. No leaks! Here are pictures to show the physical differences between the two gaskets, they are NOT the same. One may work as well as the other in some cars, but it didn't in mine. Just trying to save someone the hassle of trying to change the gasket, especially when the motor is still in the car (if you have done it you know what fun it is) with a gasket that might not work, that is physically not the same gasket as the GM one. Hope this helps someone, wish I could of know this before and just ordered GM to start with. By the way the fel-pro gasket is exactly the same as the VR gasket and both are not the same as the GM gasket, stick with the GM if you want to be safe.
Forgot to add; VR gasket is grey, GM black. Attach file:  IMG_4291.JPG (52.38 KB) IMG_4292.JPG (54.09 KB) |
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Posted on: 2012/2/21 15:29
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
 
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I understand what you're saying, Tom.
My only comment is that I've done 2 Felpro's on LT1's, installed completely dry. Zero leaks after 3 years, the underside of my car is dry and clean. |
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Posted on: 2012/2/21 16:03
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| bam | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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There must be some slight differences in motors that make the thicker gaskets leak while on other cars they are fine, a mystery??!! I forgot to mention that the lower photo shows that the GM gasket, under the timing cover is almost 1/4" thinner than the Victor Reinz, it is also thinner around the rear main seal than the VR, that is what I believe caused the leak on my car because that is where oil ran out.
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Posted on: 2012/2/21 17:48
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
Hard to say unless the pan got a bit tweeked at initial assembly. I do know that the differences in the brake line crossover placement makes it difficult or easy to get the pan off. BTW, the Felpros I've used were blue. http://www.summitracing.com/parts/FEL-OS34500R/ |
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Posted on: 2012/2/21 18:07
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| bogus | Re: LT1 oil pan gasket differences FYI | ||
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Grand Imperial Pooh-Bah
 
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I have used Felpro, but still have a minor drip in the front.
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Posted on: 2012/2/21 19:42
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
It's real easy not to get the gasket lip totally over the pan, and it's hard to see. I use a very small, flat blade screwdriver to run the outer edge of the gasket where it meets the curved front of the pan with the bolts loose. |
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Posted on: 2012/2/21 20:08
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| Matatk | Re: LT1 oil pan gasket differences FYI | ||
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Webmaster
 
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Good tips in here.
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Posted on: 2012/2/22 0:37
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bam | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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I didn't actually try the fel-pro. When I saw how far off the fit of the VR gasket was I went to the local O'Rilleys and asked to see a fel-pro, it was not blue, makes me wonder if a batch of gaskets got boxed wrong?
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Posted on: 2012/2/22 1:14
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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There may be gray ones,Tom. I use the first one at the top (blue). I really like them. http://www.summitracing.com/search/Pa ... ne-Type/V8/?Ns=Rank%7cAsc |
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Posted on: 2012/2/22 1:22
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| bam | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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Good to know, about 1/2 the cost of the GM gasket.
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Posted on: 2012/2/22 14:51
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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The nice thing about that set is it comes with gaskets and o=rings for the oil filter adapter.
The blue, plastic pieces are "gasket holders", they thread into the block at the front & rear (larger bolt holes), you then slip the gasket ovet the V part and they hold the gasket up against the block. I had to cut down the front "holders" due to clearance with the crossmsmber but all in all, a neat idea. |
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Posted on: 2012/2/22 15:02
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| bogus | Re: LT1 oil pan gasket differences FYI | ||
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Grand Imperial Pooh-Bah
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Quote:
I actually had the luxury of doing mine off the car... so there is no excuse! Except for a poor fitting gasket, or whacked out pan... |
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Posted on: 2012/2/22 16:50
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| rklessdriver | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
 
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A big problem with these one pc gaskets is that they are so grippy (can't think of any better way to describe it).
You can get leaks around the front and rear because the gasket grabs ahold of the timing cover and the rear main seal housing/adapter and it won't slide down fully against the gaps where they meet the block. A dab of silicone in the "4 corners" will let the gasket slide down/seat fully and help fill in those gaps. You don't need much - think pencil eraser sized dab. I've used the Fel Pro, Victor and Corteco/Detroit Gasket brand and never had a problem. Will |
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Posted on: 2012/2/22 17:50
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| SpectatorRacing | Re: LT1 oil pan gasket differences FYI | ||
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Elite Guru
 
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Bill, Felpro changed to the gray color a year or so ago. I'm on about my 4th in that time. I never use the RTV in the corners, have done them on and off the car, and have no leak issues. Well...not around the oil pan gasket, anyway.
I did have one of the blue ones that was bad, (2 years ago?) there was mold flash along the top face. Easily found upon inspection. |
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Posted on: 2012/2/22 18:36
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| bogus | Re: LT1 oil pan gasket differences FYI | ||
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Grand Imperial Pooh-Bah
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It was a blue Felpro that blew out on me. I wish I could find the pictures... but... the gasket blew at the corners where the gasket drops down around the timing cover. Blew them out about perfectly.
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Posted on: 2012/2/22 18:41
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| SpectatorRacing | Re: LT1 oil pan gasket differences FYI | ||
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Elite Guru
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Blew out? Due to pressure?
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Posted on: 2012/2/22 19:04
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
Could be but what I see is Fel-Pro QOS34407R is gray and Fel-Pro QOS34500R is blue. But that may have changed. |
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Posted on: 2012/2/22 20:26
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Yea, that doesn't sound quite right especially since I'm going on 4 years. |
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Posted on: 2012/2/22 20:27
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| bogus | Re: LT1 oil pan gasket differences FYI | ||
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Grand Imperial Pooh-Bah
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Quote:
I doubt it... There were signs of tearing at the turn, so I wonder if I over torqued it, causing the failure. |
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Posted on: 2012/2/22 23:51
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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Transfer
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
I did use a torque wrench on the ones I did. I went back under mine after a month, the torque held and clicked the wrench without turning the bolt. It's certainly easy to "oversqueeze" things. |
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Posted on: 2012/2/23 0:31
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| bam | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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The interesting thing to me about all this is the physical differences between the GM gasket and the VR. You can see if you look carefully at the lower pix that the GM (black gasket in the front) is shorter under the timing cover than the VR. Not only that but the GM gasket material that runs under the timing cover itself is actually thinner by about 1/8". When I put the VR gasket on for a dry fit the pan sat about 1/2" above the block where it should touch the rails of the block, I could stick my finger in there. When I tightened the pan down with the VR gasket the gasket bulged out in the front right under the timing cover, it was very obvious it did not seal right. That told me something was wrong and I didn't want to have to crawl under my vett after getting the motor back in to try and install another pan gasket, it is a job that will have you speaking lots of Chinese!
Also I went to the local auto parts store and looked at the Fel-pro #OS34500R and it is the same as the VR and different from the GM. and it was grey. The physical differences between the two gaskets is undeniable and obvious. I have had two of the VR gaskets now that did not fit, they came from Rock Auto. I can say that they were very good about returning the newest one that I did not install, even paying for return shipping! This could be a fluke, but I really would not want to crawl under my car EVER again to replace that pan gasket  ! I have done it twice!! |
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Posted on: 2012/2/24 14:52
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
Now, that's really strange. I wonder if Fel-Pro has changed and screwed up? The blue 500R fit correctly with no streatching at the timing cover. Strange that both the fel-Pro and VR are like this. Tom, do you remember if the VR fit at the rear main cap? Maybe the gary ones are for a different small block timing cover/pan. This wouldn't be the first time Fel-Pro made a mistake, they used to list LT1 valve cover gaskets as 92-96 and the 92's use the old style 91-earlier gaskets. But, it's hard to be an aftermarket mfg. and have every gasket for every car exactly right in a catalog. Good info, Tom. We'll have to be careful. |
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Posted on: 2012/2/24 15:24
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| rklessdriver | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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I just got a Fel Pro CS9966 which is the conversion set for the bottom end. It has the blue oil pan gasket.
Maybe it's just old stock. Will |
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Posted on: 2012/2/24 16:49
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| BillH | Re: LT1 oil pan gasket differences FYI | ||
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The Stig Moderator
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Quote:
Yea, I almost feel like going out to Summit and looking at a 500R to see if it's blue (and buying it). |
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Posted on: 2012/2/24 16:53
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Every man dies but not every man lives. |
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| bam | Re: LT1 oil pan gasket differences FYI | ||
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Senior Guru
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"Tom, do you remember if the VR fit at the rear main cap?
Maybe the gary ones are for a different small block timing cover/pan." No it did not fit well at the back of the pan either. I didn't lay the two gaskets back to back to compare that area, wish I would have now. I have also run into the valve cover mix up too. I am wondering if the two gaskets I got were actually for the older L98 block with the stamped steel timing cover?? |
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Posted on: 2012/2/26 2:17
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