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I know this is a revolving issue here but I need some info and I've done a ton of research. But there are still gaps.
Issue is flexplate adaptabilty

I've got a 89 5.0L that I'm dropping in my 66 Coupe no EFI just carburation I'm keeping the serpentine drive though ps and A/C. I can't afford to buy a T5 or AOD yet. So My tranny is the C4, I was reading some where that I need a 50oz 157 tooth flexplate to make it work right. The engine that is coming out which blew, is a 77 302. If my research is right it is a 28.2 oz balance 157 tooth flexplate. I've called around and no one will add weight to my flexplate. They want to balance my whole engine instead. My friend that (works at a parts store) sold me the engine, gave me a part number from motormite and said it would work 04350. I called motormite to get the details about the plate and the operator said it was like 6lbs(complete details 12-14 pitch 13.3 o.d. 157tooth). now that doesn't sound right weight that is.The application was for a 73-76 ford truck. 1.Has anyone succesfully used this in their swap? 2. Is there any other models/years that would work? 3. Am I just messed on all my info? I realize I can order one from Ford Racing or Windsor-fox but I don't have that kind of Money. 4.If I can reuse mine how can I explain to a machine shop what I want so that they'll do the work?

A few detail on the swap
73 heads with roller conversion, flattop forged pistons, stock cam (for now), Holley 600cfm and edelbrock performer intake. This is just a basic swap for now as funds increase so will the expendatures. Thank you for the Help
 

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So, you're putting an old C4 behind a late model engine....

The old converter won't fit the flexplate that's on the late engine, yes? Or is there a flexplate on the late engine?

If you have access to a 50oz imbalance flexplate to use as a sample, any competant balance shop can match the imbalance on it to that of a flexplate you can use with your converter...

Personally, I'd take this query to a local independent trans rebuilder, preferably a wholesaler...they've got tons of flexplates in stock and have likely been down this road many times before...

You should be able to do this from existing stock.....

Last flexplate I had matched cost 50 bucks.....usually takes less than an hour to set up and do...

Pat
http://www.jps.net/binay/webdocs/strtmstng002_sml.JPG
 

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Check Mustangs Plus or Mustangs Unlimited. One of the 2 carries the correct 50 oz. 157 tooth flywheel for this type of swap. I seem to remember it was about $160.00. It just might cheaper than buying a used one and modifying it.

Tom
You can do anything you want to......ONCE!
aka "my 66 coupe"
 
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oh yes you are the guru here, there is no flex plate on the late model, i would have to use my old one or by a new 157 w/o weight for a trans specialist to do this. I asked around about this and people looked at me like I had two heads maybe if I had a rice burner they'd understand. I'll check a tranny specialist in the morning
 
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