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Old 08-16-2011, 01:10 AM
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Flexplate question

Ok so i have a 350 hecho en mexico 3970010 block i was told it was a crate engine when i picked it up. It needed some parts to get back together. I got a flex plate for free from a dude in state. He told me its off his 90's suburban its a larger 168 tooth. My major question is I've read there are differences in one piece mains an two piece main flexplates. Will the flex plate i got work on my 350. The flex plate is balanced on the plate. The number on it is 10101170.

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Old 08-16-2011, 05:33 AM
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Flexplate puzzle

The 168 tooth flex plates are 14.13" O.D., use a starter with offset bolts and the 1987 - up flex plates have a 3" crank flange bolt circle, have a counter weight for a internally balanced engine and fits the crankshafts with a one-piece rear seal.

Some of the SB Chevy flex plates have a 10.75" diameter torque converter bolt circle, some have 11.50" diameter torque converter bolt circle and some have both bolt circles. My 700R4 transmission uses a flex plate with a 10.75" torque converter bolt circle. A TH-350 and TH-400 must be checked because those transmissions could have either a 10.75" or a 11.50" torque converter both circle.

The 10101170 flex plate fits a 1991-2000 BB Chevrolet with a cast iron crankshaft and has 168 tooth starter ring gear. That is all I know about that one.

Last edited by MouseFink; 08-16-2011 at 05:48 AM.
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Old 08-16-2011, 05:41 AM
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the crank register is smaller on a one piece seal crank and they are externally balanced.
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Old 08-16-2011, 12:54 PM
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so is that a no it wont work? cause im using a t-350 so do i need a smaller flex
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Old 08-16-2011, 02:36 PM
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Flex plate puzzle II

You need to get the correct flex plate for your application. Unfortunately, you may have to actually look and see if the block uses a 1-piece or 2-piece rear main seal.

You will need to use a starter with off-set mounting bolts and the flex plate should be:

GM - 471598
flex plate for a 2-piece main seal, 14.13" OD, 3.58" crank flange bolt circle, 168 tooth starter ring gear, no counterweight, 1970-1985. .

or

GM - 14088761
flex plate for a 1-piece main seal, 14.13" O.D., 3.00" crank flange bolt circle, 168 tooth starter ring gear, with counterweight, 1986 - up

Since those flex plates have a 10.75" and a 11.50" diameter torque converter bolt circle, they will fit any TH350 or TH400 torque converter.

Last edited by MouseFink; 08-16-2011 at 02:54 PM.
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