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Hey guys trying to marry my 80-85 year 350 to my 700r4 the flexplate on the 350 will not bolt to my torque converter . What flexplate can I use? Im not sure how many teeth it should be I think 158? Will a flexplate off a 4.3 have the same teeth?
 

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Cornerin Demon
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Hey guys trying to marry my 80-85 year 350 to my 700r4 the flexplate on the 350 will not bolt to my torque converter . What flexplate can I use? Im not sure how many teeth it should be I think 158? Will a flexplate off a 4.3 have the same teeth?
153 or 168 count

my guess is you might have a 350 built for a turbo 350 - 400 tranny...i belive they are not the same as the 700r4... although i'm not for sure, thats my only guess with minimal research into the subject
 

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Does that flexplate have 2 different torque converter bolt patterns like some of the 350turbo flexplates do?
 

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used the same flex plate for my th350 and 700r4, there should be 2 bolt patterns on the flex plate. if not run to the parts store and ask to see a replacement flex plate and check if its got 2 patterns. i bought a replacement for a 78 350 and worked just fine
 

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Hardhead
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They make flexplates with dual patterns just for this reason. The difference in tooth count on flexplates is due to the type of starter being used. IIRC, if your starter has a staggered bolt pattern it uses the 168 tooth flexplate and if they are across from one another they use the 153. The other thing you might have to watch out for is a possible balance issue.
 
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