Is 307 crankshaft drilled for pilot bushing? - Team Camaro Tech
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Old Jun 10th, 15, 09:27 AM   #1 (permalink)
 
Join Date: Jun 2015
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Is 307 crankshaft drilled for pilot bushing?

I have a 307 engine and a TH350 trans from a 73 Camaro. It is in a different car now, not in the Camaro. I want to change the TH350 to a Muncie 4 speed.

I have all the parts ready to do the swap, but before I drop the trans, I need to make sure I have the correct pilot bushing. I have not been able to find any definitive answer as to whether the crank on the 307 is finished drilled from the factory for a standard 4 speed pilot bushing (1.094 O.D.)

So, my question is: Does anyone know for sure whether a factory 307 that came with an automatic trans had the crankshaft drilled for a pilot bushing the same as a factory 307 that came with a manual transmission? If not, what is the O.D. of the hole size in the crank?

Thanks for your help,
Terry
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Old Jun 12th, 15, 04:25 PM   #2 (permalink)
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Re: Is 307 crankshaft drilled for pilot bushing?

If you Chevy SB came with a 307/327 (Cast or Forged Crank) without a pilot Bearing let the Machine Shop do it to fit a Manual Trans - Don't go aftermarket Needle Bearing Pilot Bearing and ensure the Bell Housing is aligned or you will wreck your Manual Tranny and possibly damage your Main Berings.

Ron
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Old Jun 13th, 15, 02:55 PM   #3 (permalink)
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Re: Is 307 crankshaft drilled for pilot bushing?

Really rare a 307 that isn't drilled.
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Old Jun 18th, 15, 12:55 AM   #4 (permalink)
 
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Re: Is 307 crankshaft drilled for pilot bushing?

Z15CAM: Yes, I have 2 oilite bushings, one is 1.094 for a finished drilled crank and one is 1.065 for an unfinished drilled crank. I should be good with one of these two based on everthing I have read.

hhott71: That's good to hear!

Thanks for the info!

Terry
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Old Jun 19th, 15, 09:40 AM   #5 (permalink)
 
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Re: Is 307 crankshaft drilled for pilot bushing?

The 307 that came in my 73 had a saginaw 3 speed from the factory
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Old Sep 23rd, 15, 07:37 PM   #6 (permalink)
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Re: Is 307 crankshaft drilled for pilot bushing?

307s were available with a 3 speed manual not a 4 speed
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Old Sep 30th, 15, 12:32 AM   #7 (permalink)
 
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Re: Is 307 crankshaft drilled for pilot bushing?

Just posting a followup for future reference.

The 307 was finished drilled and the standard pilot bushing went right in!

Thanks for everyone's help!!!

Terry
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Old Oct 20th, 15, 11:34 AM   #8 (permalink)
 
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Re: Is 307 crankshaft drilled for pilot bushing?

Quote:
Originally Posted by 69CamaroConv View Post
307s were available with a 3 speed manual not a 4 speed
"I" believe this is inaccurate. I bought a 71 307 sport coupe with a saginaw 4 speed in 1978. 20000 miles, I did not check numbers but believed it to be original.
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Old Oct 20th, 15, 04:27 PM   #9 (permalink)
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Re: Is 307 crankshaft drilled for pilot bushing?

Quote:
Originally Posted by 69CamaroConv View Post
307s were available with a 3 speed manual not a 4 speed
Huh? Uh, I think you are mistaken. My 69 Factory 307, 4 speed M20 Camaro is proof that a 4speed option was available for the little 307 and name your price, I will bet the ranch that I know the facts.
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