warrenp Posted February 23, 2005 Share Posted February 23, 2005 i just put the big my big block 454 gen 6 in to my truck and the flywheel does not bolt to the torque converter. is this normal? Quote Link to comment Share on other sites More sharing options...
Guest Magnum Rockwilder Posted February 23, 2005 Share Posted February 23, 2005 All GM TQ's [i[should[/i] bolt up to all GM flexplates... but I'm unfamiliar with all the newer stuff, so...?!? Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted February 23, 2005 Share Posted February 23, 2005 All GM TQ's [i[should[/i] bolt up to all GM flexplates I am not sure that is totally correct but can only speak from one experience in this instance. We were working on freinds 67 GT0 where his flywheel had a small bump out that kept the chevy TC from fitting up right. Quote Link to comment Share on other sites More sharing options...
warrenp Posted February 24, 2005 Author Share Posted February 24, 2005 i was just talkin to a guy on the phone that seems to think that a th400 and a th350 torque converters are not quite the same. he claims the th400 has a wider pattern. thans the 350. he claims the was a flex plate made to fit both th400 and th350's but they are hard to come by. if some one here could varify the info that would be great!!! Quote Link to comment Share on other sites More sharing options...
jbk240z Posted February 24, 2005 Share Posted February 24, 2005 I have heard of this as well. I have seen the flywheels with dual bolt patterns, but don't know what vehicles they came from. Good luck Quote Link to comment Share on other sites More sharing options...
warrenp Posted February 24, 2005 Author Share Posted February 24, 2005 i was trying to find one on ebay but the only one i found was for an internally balanced engine. also does it matter if it was 1 piece rear maine seal or 2 that the flexplate came from? Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted February 24, 2005 Share Posted February 24, 2005 Yup, they are different from one piece to two piece rear seal. Yes, chevrolet did make a flexplate that only had one bolt pattern I have one of those as well as several 400sbc stock flexplates and a 400sbc flywheel. Later years had dual bolt pattern. I have a small 153 tooth sfi flexplate, dual bolt pattern that is new and never run for $70, which is what I paid for it. I installed it and then found that the converter mounting bolt "ears" stuck out past the ring gear and would hit the starter. Quote Link to comment Share on other sites More sharing options...
warrenp Posted February 24, 2005 Author Share Posted February 24, 2005 yeh, that would be my concern one the size. i'm not sure what size mine is. i think it's the bigger one 168 tooth????? the flex plate needs to be externally balanced also. prefer dual pattern for a 1 piece rear maine seal Quote Link to comment Share on other sites More sharing options...
warrenp Posted February 28, 2005 Author Share Posted February 28, 2005 i got it fixed and back in already! i bought a turbo 400 torque converter and put it in to my 350 turbo trans. worked out great! Quote Link to comment Share on other sites More sharing options...
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