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OT. Externally balanced 350 question

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hogman_2002

03-30-2007 20:52:13

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My brother bought a 350 crate engine for his 81 suburban. The crate engine came with a flex plate that is too small for the 400 turbo transmission. Can he just buy the right sized externally balanced flex plate and put it on, or does he need to have the damper, crankshaft and flex plate balanced as an assembly?

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Richard H.

03-31-2007 07:05:08

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Re: OT. Externally balanced 350 question in reply to hogman_2002, 03-30-2007 20:52:13

Well it is a crate motor and the paper work should say or call the manufacture , the guys below are all right with what they say. Are you saying it came with a 12" plate? either way if the plate it has on it has a weight welded to it then it is probably external. I just finished building a sbc 383 all new except for the block and the choice was mine on int or ext. balance . The block I used is a 010 1972. Depends on "what type" crate he bought 2k or 8k dollars?

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jdemaris

03-31-2007 06:15:06

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Re: OT. Externally balanced 350 question in reply to hogman_2002, 03-30-2007 20:52:13

All the Chevy V-8s that I know of, from 1955 - 1985 are internally - i.e. "neutral balanced" except for certain BB 454s and the SB 400s. Just about all the Chevy small-blocks made from 1986 to 1993 with small-journal cranks are externally balanced, i.e. "Detroit Balanced."

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Allan In NE

03-31-2007 02:03:20

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Re: OT. Externally balanced 350 question in reply to hogman_2002, 03-30-2007 20:52:13

Part number 10067353?

It is internally balanced. Just pitch that shipping flywheel and install the correct one.

You're probably going to run into issues with the valve covers, timing cover pointer and quite possibly, depending on application, the oil pan too.

If so, just use the originals and you should be good to go.

Allan

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Bob

03-30-2007 21:35:29

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Re: OT. Externally balanced 350 question in reply to hogman_2002, 03-30-2007 20:52:13

Normally; a Chevy 350 of that era (pre 1986) is INTERNALLY BALANCED; meaning the flexplate is "neutral balanced" meaning it has NO counterweight.

Is that was your brother has?

If so; simply get a standard "THM-400 style" flexplate for a 350 engine of that era.

ASSUMING the engine IS a 350; if the flexplate that came on the engine is correct for the engine and HAS a counterweight; either the engine is a 1986 and up "one-piece main seal" engine OR some custom-balanced hot-rod engine that requires a weighted flywheel.

The 1986 and up "one-piece rear main seal" 350 engines have a smaller flywheel-to-crank flange mounting bolt circle than the older engines AND a good-sized counterweight; so you can't use an older "THM 400-style" flywheel on the 1986 and newer engine; if that is what you actually have.

Post back with the rest of the details... the source of the engine; and is it the 1986 and newer style?

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hogman_2002

03-31-2007 06:54:57

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Re: OT. Externally balanced 350 question in reply to Bob, 03-30-2007 21:35:29

The engine he took out of the suburban is the original 350 engine that is internally balanced. The engine he bought is a GM Performance Parts 350 HO Deluxe engine(12496968). It is the 86 and later block with the one piece rear main seal and the engine is externally balanced. The spec. book he got says to use either flexplate 12554824 or 14088761 if the flexplate sent with the engine isn't the right one. Either one will work because the both have the right bolt hole pattern for the torque converter. One is a heavy duty flexplate and one is a regular flexplate. So now he needs to know if the rotating assemble needs to be balanced or can you put the new flexplate on and not have any issues.

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