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One piece or two piece seal????

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Old 12-10-2006, 06:42 PM
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Car: 84 Camaro
Engine: 355 or 5.7
Transmission: th 700 r4
Axle/Gears: stock
One piece or two piece seal????

Does any one have any pictures i need to no which one i have and im not sure???????
Old 12-10-2006, 07:50 PM
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Car: '89 Trans Am GTA
Engine: WAS 350 - now L92 (alum. 378/6.2L)
Transmission: WAS 700R4, now a built T56
Axle/Gears: 3.27 9-bolt
You should be able to get the casting number from the engine block & look it up on mortec.com...
Old 12-10-2006, 07:59 PM
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Car: 91 rs,1 92 rs,92 b4c/1le
Engine: 5.0tbi,5.7 tune port/5.0tpi
Transmission: 5spdx2 and t56
Axle/Gears: 3.08,3.73,3.42
non efi block are two piece
Old 12-11-2006, 07:13 AM
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It has nothing whatsoever to do with EFI. There are plenty of 350 blocks with 2-pc RMS that came with FI on top of them. And even 283 and 327 ones.

Look at the back of your block where the crank comes out of it. If the crank is PERFECTLY round, and there's a big cast aluminum plate or housing sort of thing back there, it's a 1-piece.

If the crank has a funky shaped flange on it that looks sort of like a counterweight for some odd reason, and there's nothing else back there besides the block and the oil pan, then it's a 2-piece.
Old 12-11-2006, 12:58 PM
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Car: 82 Berlinetta/57 Bel Air
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Originally Posted by driver101
non efi block are two piece
To add to that, with regard to 3rd gens specifically:

1986 - advent of one-piece rear main seal.

Before that:
1982 - 1983: LU5 "cross-fire" = EFI

1985: LB9 "TPI" = EFI
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