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440 bolts #1432291
05/08/13 11:52 AM
05/08/13 11:52 AM
Joined: Jan 2003
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L.I. N.Y. Hemi Street
HemiGreg Offline OP
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HemiGreg  Offline OP
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L.I. N.Y. Hemi Street
what size is the head of factory converter to flex plate bolts (4) thanks

Re: 440 bolts [Re: HemiGreg] #1432292
05/08/13 12:29 PM
05/08/13 12:29 PM
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JohnRR Offline
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I want to say 9/16, it is a 5/16 thread bolt which normally has a 1/2 head , but I think because of how thin they are they are the next wrench size up ?????

Re: 440 bolts [Re: JohnRR] #1432293
05/08/13 04:11 PM
05/08/13 04:11 PM
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L.I. N.Y. Hemi Street
HemiGreg Offline OP
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Re: 440 bolts [Re: HemiGreg] #1432294
05/09/13 01:12 AM
05/09/13 01:12 AM
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chicagoland,usa
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buildanother Offline
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I'm gonna agree with John that they have 9/16" heads and are 5/16" fine thread bolts. A little unique to the old mopars...maybe newer ones too.

Re: 440 bolts [Re: buildanother] #1432295
05/09/13 01:37 AM
05/09/13 01:37 AM
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1_WILD_RT Offline
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Re: 440 bolts [Re: 1_WILD_RT] #1432296
05/09/13 08:27 AM
05/09/13 08:27 AM
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Upper Midwest
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MoparforLife Offline
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Yep factory flexplate is 5/16 with a odd 9/16 head.

Re: 440 bolts [Re: MoparforLife] #1432297
05/09/13 10:01 AM
05/09/13 10:01 AM
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n/w, PA
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demonH1B Offline
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Unless you are working with a Hemi converter, they use 7/16 bolts.
Some hi-stall after market converters use 7/16, as well. All others
are 5/16.
I believe there are bolt kits available from Mopar and others
with the thin head bolts.

Re: 440 bolts [Re: demonH1B] #1432298
05/09/13 11:05 AM
05/09/13 11:05 AM
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Carson City, NV
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babarracuda Offline
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Flex plate bolts have a 3/4" head. The factory bolts had 5/16 thread and after market has 3/8 both with fine thread

Re: 440 bolts [Re: babarracuda] #1432299
05/09/13 11:38 AM
05/09/13 11:38 AM
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JohnRR Offline
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Quote:

Flex plate bolts have a 3/4" head. The factory bolts had 5/16 thread and after market has 3/8 both with fine thread




The bolts that hold flexplate to the crank have 3/4 heads , the flexplate to convertor are 9/16 in the case of an engine with it's original convertor.

the original question

Quote:

what size is the head of factory converter to flex plate bolts (4) thanks









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