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

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Old 02-01-2012, 03:23 PM   #1
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Default lt1 Cranks

HI there i recently spun my bearings and the crank got damaged bad I decided to just buy one thats .10 .10 Well my question is that if all lt1 cranks interchange my motor is a 93 lt1. which crank do i need a 1 rear main seal or 2 rear main seal i.d like to know because i want to buy the right part.
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Old 02-01-2012, 03:39 PM   #2
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all LT1's are 1 piece rear main seal cranks and blocks........if your buying a new crank why are you buying one thats .10/.10??
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Old 02-01-2012, 04:39 PM   #3
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I would get the block checked.
If it's a main bearing which I assume that you spun the mains might have to get looked at and see if it's ok.

I spun a main bearing (cracked crank) and it trashed the block beyond repair.
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Old 02-01-2012, 05:16 PM   #4
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93 94 Engines have different cranks.I found that out today i tried a 96 crank in a 94 and the caps are different..1 rear main
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Old 02-01-2012, 05:59 PM   #5
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The 94 crank are basicly identical. heck I ran an 86 1pc rear main seal in a 97 LT1 once.

Balance the assembly and put it together.
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Old 02-01-2012, 06:00 PM   #6
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I also in a pinch once ran a 305 1 pc RMS crank in an LT1........
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Old 02-02-2012, 01:02 AM   #7
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it was a rod bearing that got spun .. the reason i.m getting a 10/10 is because i cant afford a new one and beacause i getting the crank thats 10/10 with matching bearing for 150 ... so i,m still confused do they interchange or not??
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Old 02-02-2012, 04:59 AM   #8
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The cranks do interchange!
'87-'97 5.0-5.7
'87-'98 trucks
If you purchase the 2pc to1pc rear seal conversion you can use a crank from old school 1st gen SBC in the Lt1
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Old 02-02-2012, 06:50 AM   #9
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Quote:
Originally Posted by lt-1guy96 View Post
93 94 Engines have different cranks.I found that out today i tried a 96 crank in a 94 and the caps are different..1 rear main
Not sure what you mean by the caps being different? Do you mean you took a different crank than what was in your 94, plopped it in and expected it to flawlessly fit?
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Old 02-02-2012, 07:54 AM   #10
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Quote:
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Not sure what you mean by the caps being different? Do you mean you took a different crank than what was in your 94, plopped it in and expected it to flawlessly fit?
yea i dont get that one either.................

OP, the parts themselves, blocks, cranks, main caps from all lt motors interchange.....obv 2-bolt and 4-bolt respectivly......however all will require machining usually due to tolerances, wear, and prior modifications.......main bearing clearance, rod bearing clearance and main cap housing bore diameters should all be checked durring assembly as with any engine....but the cranks do interchange..........any 1 piece GM GEN I or GEN II (LT) crank will go in your motor......as with rods they are the same......and acutally rod bearings interchange with all GM engines from SBC to LT to LS1....they all run the GM 2.100 rod journal size.......

for example i run a Callies 2-Piece main SBC crank in my car but i just bought an adapter to go from 2 piece crank to a 1 piece block.......my rods are olivers for a sbc and as are my pistons......it all interchanges........
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Old 02-02-2012, 07:54 AM
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