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04-03-2012, 12:24 AM
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#1 |
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Registered User
 Join Date: Sep 2011
Location: In front of the fire
Posts: 26
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bolt size/thread for crankshaft snout?
I'm finishing up my rebuild for the War Wagon. The motor is the original 307 V8. On teardown, I noticed the harmonic balancer bolt was missing and the threads look a little munged up. Anyone know what is the correct size and thread pitch for a 1969 307 crankshaft? I need to get a new bolt and probably need to run a tap to clean up the threads.
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04-03-2012, 12:18 PM
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#2 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,141
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Re: bolt size/thread for crankshaft snout?
GM used two sizes for the small blocks, 7/16-20 and 3/4-16. All mine have been 7/16-20.
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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04-03-2012, 07:53 PM
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#3 |
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Registered User
Join Date: Sep 2011
Location: In front of the fire
Posts: 26
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Re: bolt size/thread for crankshaft snout?
Thanks Lee. I should have searched before I posted, but it sounds like many (all?) 307 and 327 motors do not have a harmonic balancer bolt!
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