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Which flexplate for C4 behind 351?
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Posted by: rpm4lalo

I have a 69 Fastback. It now has a mid eighties 351 swapped and the c4 I have in there, at first would not bolt up to the block since the 351 flexplate was too large in diameter. I used a flexplate out of a 81 and up 302 and it bolted up and cleared the bellhousing and just seemed like a perfect fit until I went to put the nuts to tighten the TC to the flexplate, the studs were too far pst the flexplate. They all lined up great, but I now have a clerance problem with these bolts. I looked at my 351 flexplate and it has an "offset" where it bolts up, but my smaller 302 flwheel does not. The weight is also having a clearance problem. On a side not the 351 uses 28.2 oz of unbalnce while 81 and up 302's used 50 oz of unbalance but if I could just find the right flexplate with the right "offset" then I could have it rebalanced to correct this.
But what flexplate from what car and year should I ask for when I head to my local parts store or dealer?

Posted by: BENDERSUCKSNUTS

I would love to help you, but I'm a nazzy and know nothing about cars or anything since I have a 2 years olds education

Posted by: BENDERSUCKSNUTS

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Posted by: BENDERSUCKSNUTS

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Posted by: BENDERSUCKSNUTS

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Posted by: boss66tcode

Try mid 70's torino/Ranchero flexplate...they didn't change the 351W's balance, and these cars had c-4's. Some LTD's also had the c-4. F-150's of early 80's had a combination of c-4 and 351W.
Any of these should work.
Good luck with the project.

Posted by: droff85

i was about to tell you the same thing that boss66tcode told you. i have one arguement with him though. i know the 5.0 had a 158 or a 164 tooth im not exactly sure on the 351 though. i also know that you would be better off getting one for a torino or a car because the trucks are going to have a bigger bell housing and they may not swap. just some of my thoughts though hopefully they will be helpful.