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Old 04-23-2010, 06:02 PM
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Torque Convertor ID??

Hey guys,

I recently pulled out a 350 SBC from a Chevy Luv truck. The truck currently has a T350 tranny in it. I am trying to identify the torque convertor.

It measures about 12 to 12.5 inches in diameter and has the following stamped into it "GM350HP". It also appears to have factory blue paint on it.

Any idea on how I can identify this thing? The guy who sold it to me said it was a 3000 stall but I was wondering if there was any way to verifty the type of convertor and it's stall speed.

Also, I am replacing the 350 SBC with a Gen IV 454 BBC and the big block is currently on an engine stand and I can not really get to the back of the crank. Will the flex plate fit both applications? If not, what type of flex plate do I need and what is the diameter of the center hole on the needed flex plate as well as the center to center spacing of the flex plate to crank bolt holes?

Any help will be greatly appreciated. Thanks.

Brent

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Old 04-23-2010, 06:20 PM
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Can't help you with the converter id but to tell you it isn't likely to be 3000 stall at that 12 to12.5 inch diameter. 3000 stall will require at least an 11 to 10 inch converter core.

the 454 has its own special flexplate due to the external balance counterweight that is on it, specific to just the 454 and it doesn't interchange with any other flexplate. Center hole diameter, converter bolt pattern and crank bolt pattern is the same as the flexplate you pulled from the 350, but the balance factor is not the same as the 350. The 350 flexplate is nuetral balance and has no counterweight on it. This is assuming that both engines are 2-piece rear main seal.
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Old 04-23-2010, 06:39 PM
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Thanks Eric. Always appreciate your input. Guess I will be ordering another flex plate and convertor.

Brent
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