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Old 05-07-2011, 07:00 PM
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chev 350 flywheel to flexplate

Not sure if I'm posting in the right place but here goes.I have a 79 chevy 350 from a manual trans truck and I want to take the flywheel off and put a flexplate on for the turbo 350 before I put it in my 39 Chevy.is there any thing I should know before I do this ie size of flexplate,how many teeth,switch the starter.I have a couple of flexplates from 350s sitting around.Any help would be appreciated

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Old 05-07-2011, 07:43 PM
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Since the 350 is internally balanced, make sure the flexplate you install does not have weights on it (i.e. a 400 flexplate, which is externally balanced), same as with the balancer. You can use 153 or 168 tooth flywheel, most starters are universal.
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Old 05-07-2011, 07:46 PM
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I am sure it is 168 teeth on the 350,all should have the same.The 305 has less teeth,don't know how many off hand.Hope this helps.
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Old 05-07-2011, 07:54 PM
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flywheel to flrxplate

Thanks for the quick replies,guys.I'll check out the flexplates I have and let you know if one of them works
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Old 05-07-2011, 08:27 PM
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flywheel to flex plate

Also remove the pilot shaft beering from the crankshaft.
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Old 05-07-2011, 10:41 PM
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Quote:
Originally Posted by monte_go
I am sure it is 168 teeth on the 350,all should have the same.The 305 has less teeth,don't know how many off hand.Hope this helps.
GM from 265 up through some big blocks could have either 153 or 168, there's no rule. OEM was 14", 168 teeth from '86 on up, that doesn't mean that's what's on there, either will work. OEM torque converters had 10 3/4 and 11 1/2 inch bolt patterns, keep that in mind.

Some pilot bushings are next to impossible to get out. If you can't get it out I wouldn't worry about it.
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Old 05-07-2011, 10:57 PM
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Quote:
Originally Posted by dave1939
Not sure if I'm posting in the right place but here goes.I have a 79 chevy 350 from a manual trans truck and I want to take the flywheel off and put a flexplate on for the turbo 350 before I put it in my 39 Chevy.is there any thing I should know before I do this ie size of flexplate,how many teeth,switch the starter.I have a couple of flexplates from 350s sitting around.Any help would be appreciated
If you match the diameter of the flexplate to the diameter (or tooth count- same thing) of the existing flywheel, you can reuse the same starter as you now have- unless the set-up uses a bellhousing-mounted starter.

The big, 168T flexplate/flywheel uses the staggered bolt hole starter, the small 153T flex/fly uses the straight-across bolt hole starter- they will not interchange.

Most aftermarket mini-starters will allow the use of either size flex/fly. Manual transmission starters for the big bellhousing have a cast iron nose, the aluminum nose starters can cause interference/clearance problems. Not an issue if using the small bell/153T bellhousing.
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Old 05-10-2011, 12:56 AM
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before you bolt it all up make sure that its the same bolt pattern as the torque converter otherwise get the right size or the one that has both bolt patterns. I had 2 flex on me a while back also so make sure you get the HD model if you get one from a parts store. Definitely use loc-tite on the bolts too
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