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Which flexplate for C4 behind 351?

  • Thread starter Thread starter rpm4lalo
  • Start date Start date Dec 5, 2004
R

rpm4lalo

New Member
Dec 5, 2004
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0
Dec 5, 2004
#1
  • Dec 5, 2004
  • #1
I have a 69 fatsback which now has a mid 80's 351, the flexplate it came with was too large in diameter to fit in my C4's behousing, so I use a 81 and up 302 flexplate and almost everything bolted up correctly. one problem, the TC studs are sticking too far past the flexplate creating a clearance problem.

The weights are different, but I can alwasy get it rebalanced but the offset on the flwheel is not he same causing the clerance problem, if I go to my local parts store what year and car should I specify in order to get the right flexplate for my setup?
 
D

D.Hearne

New Member
Sep 29, 2000
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south louisiana
Dec 5, 2004
#2
  • Dec 5, 2004
  • #2
You need a 28 oz/in balance 157 tooth flexplate. The one you have now is a 50 oz/in. All 351 W & C's used the 28 oz/in balance. You can spec a 289-302 flexplate for any small to mid size car,up to around 1979, those will should have had the smaller 157 tooth flex with a 28 oz/in balance. The switch to the 50 oz version happened sometime between 80-82.
 
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