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302W balancer problem 

 

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 Post subject: 302W balancer problem
Posted: Wed Jul 12, 2006 12:06 am 
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I have a problem which i hope someone can shed some light one. I have just installed a 302W EFI throttle body engine ('84 vintage I think) but have gone back the a carbie setup. I have used a early 10'' flex plate & C4 box. The original flex plate was a 11''. The harmonic balancer is original. The problem is I have a vibration from 1000 to 2500 RPM. I have been told that the later EFI windsor had a different size counter balance weight than the early windsors. Has anyone hear of this? I think they said the early windsors had a 28oz weight while the later EFI windsors have a 50oz weight. Is this fact? Could this vibration be anything else? Either way I have a s**t job pulling this motor out this weekend to find the problem.

 

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Posted: Wed Jul 12, 2006 12:20 am 
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were you using the same flex plate and torque converter before? maybe one of them could be out of balance?
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Posted: Wed Jul 12, 2006 1:08 am 
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yes, there are different flexplate and harmonica balancer weights for old and new windsors

 

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Posted: Wed Jul 12, 2006 10:22 am 
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Yep early have 28 ounce while latter [1995 on ] have 50 ounce...

 

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Posted: Wed Jul 12, 2006 5:10 pm 
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'82 up 5.0L's have a 50oz imbalance
Pre-'82 have a 28oz imbalance like all other smallblocks.
You'll need a flexplate with a 50oz imbalance to go with your engine.

Pete.
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