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02-01-2024, 04:35 PM | #1 |
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GM sportsman Bow Tie sbc block question
late 90.s GM Bow Tie Sportsman sbc block question .. engine still in car how do I tell if it is a 1 or 2 piece rear seal .. i see the aluminum seal plate behind the crank flange in photos of BowTie blocks in GM catalog but no other data telling me if a 1 or 2 piece without disassembly .. has typical 6 bolt crank flange .. thanks
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02-01-2024, 05:27 PM | #2 |
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Re: GM sportsman Bow Tie sbc block question
They do come both ways.
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Mike Pearson 2485 SS |
02-01-2024, 07:13 PM | #3 |
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Re: GM sportsman Bow Tie sbc block question
Yes Mike I know both blocks come both ways .. thats my question how do I identify with out disasembly without pan off .. is the aluminum seal plate blocking a way of knowing 1 or 2 piece without teardown ?
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02-01-2024, 07:36 PM | #4 |
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Re: GM sportsman Bow Tie sbc block question
If it has the aluminum seal plate then it is a one piece seal block. The two piece does not use that aluminum plate. You can run a 2 piece crankshaft in the one piece blocks with the adapter. The work fine.
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Mike Pearson 2485 SS |
02-01-2024, 08:01 PM | #5 |
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Re: GM sportsman Bow Tie sbc block question
Mike .. so how come on the GM perf parts site both photos of sportman blocks have aluminum seal plates for 1 & 2 piece
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02-01-2024, 08:03 PM | #6 |
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Re: GM sportsman Bow Tie sbc block question
so mike how come on the GM perf parts website they show photos of both BowTie block part # .s of 1 & 2 piece with aluminum seal plates
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02-01-2024, 08:28 PM | #7 |
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Re: GM sportsman Bow Tie sbc block question
If it’s a one piece seal they still have a plate. The two piece adapter bolts to the same flange and has the groove for the two piece seal. That way you can run a 2 piece crankshaft or the one piece crank in those blocks. I have one bow tie block that is for a two piece seal only and it does not have a plate. It has a standard rear main cap. You can only use a two piece seal crank in that block.
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Mike Pearson 2485 SS Last edited by Mike Pearson; 02-01-2024 at 08:38 PM. |
02-01-2024, 09:00 PM | #8 |
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Re: GM sportsman Bow Tie sbc block question
can you see the flange on the crank?
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02-01-2024, 09:14 PM | #9 |
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Re: GM sportsman Bow Tie sbc block question
yes can see flange ..its scalloped around one side of 3 bolts & regular curved edge along where dowel pin would go
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02-02-2024, 12:33 PM | #10 |
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Re: GM sportsman Bow Tie sbc block question
If it has a flange a one piece seal can't slide over it.
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