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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Rear main Seal ? LT1

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Old Jun 19, 2013 | 01:08 PM
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Default Rear main Seal ? LT1
opinions, Rubber or Teflon Felpro

IIRC OEM was rubber
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Old Jun 19, 2013 | 02:17 PM
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I have the Felpro on mine, no issues with over 3k of driving.
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Old Jun 19, 2013 | 02:28 PM
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I just bought the Felpro teflon rear main seal at Advance Auto only $20. The rubber one was $22. Totally leak free. The teflon RMS goes on the crank without any lube.
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Old Jun 19, 2013 | 03:39 PM
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this one was recommended by my machine shop

felpro # 2919 high performance silicone seal

http://www.summitracing.com/parts/fel-2919/overview/

anyone use this?
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Old Jun 19, 2013 | 04:50 PM
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Originally Posted by ******
this one was recommended by my machine shop

felpro # 2919 high performance silicone seal

http://www.summitracing.com/parts/fel-2919/overview/

anyone use this?

I've used it also.....
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Old Jun 19, 2013 | 05:03 PM
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Originally Posted by leadfoot4
I've used it also.....
on a LT1?

is it rubber or silicone??
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Old Jun 20, 2013 | 06:29 AM
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Originally Posted by ******
on a LT1?

is it rubber or silicone??
I think it's more of a Teflon seal. From what I understand, GM went to this seal in the 1997 model year, in an effort to cure one of the LT1's numerous oil leak sources. When I installed this seal in my car, I found oil in the screw holes where the seal retainer attaches to the block. I have no idea how oil got in there, but when I reinstalled that part, I put a dab of thread sealer on the bolts, just for insurance....
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Old Jun 20, 2013 | 09:57 AM
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Originally Posted by leadfoot4
I think it's more of a Teflon seal.....
the 2919 is not the Teflon seal. It is designed for race motors running vacuum pumps

the "teflon" one you note is # 40626 and the rubber seal is 40520

yeah GM switched to the teflon one in 97

I am going with the rubber one.
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