HELP! 327 crank bolt size? - Team Camaro Tech
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post #1 of 9 (permalink) Old May 2nd, 01, 12:47 PM Thread Starter
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I have a 327 small jurnal steel crank motor
does any one know the sizeof the center bolt
I tried one from a 350 it's a hair to big and won't go
if some one know the right bolt where can I get one?

iching to run it,but don't want to loose the balancer!

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post #2 of 9 (permalink) Old May 2nd, 01, 12:54 PM
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Your crank did not come with a bolt installed in the end. the balancer was just pressed on. up until 68 Chevy did not put a bolt in the end of the crank but you can get a bolt from a major bolt supplier but it is a wierd thread and you must match it or you will tear it up.

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post #3 of 9 (permalink) Old May 2nd, 01, 01:15 PM Thread Starter
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but would the crank still be threaded?
it is a CE motor
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[This message has been edited by 4 speed (edited 05-02-2001).]
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post #4 of 9 (permalink) Old May 2nd, 01, 03:52 PM
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4speed (wish you guys would use your real names)
Small block cranks that are threaded from the factory are 7/16 x 20... fine thread. The 350 bolt should go in. The threads might be messed up a bit from using a balancer remover without the proper center piece. I would get a 7/16 x 20 tap and try running it into the threads first. Just be careful because someone else might have threaded it a different size.

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post #5 of 9 (permalink) Old May 2nd, 01, 03:58 PM
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The crank should'nt even be threaded. I have 2 67 small journal cranks, nothing there.
There's been some discussion here before about using the proper installation tool when putting on a balancer, and I agree, I have a tool for it, but when I'm dealing with a crank with no bolt holes, it's a block of wood and a sledge hammer. No other way around it. Once you get it on, it should stay.

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post #6 of 9 (permalink) Old May 2nd, 01, 05:40 PM
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HP. small journal 327 steel cranks were drilled for a bolt

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post #7 of 9 (permalink) Old May 3rd, 01, 01:25 AM Thread Starter
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I can see threads in the crank,and have tried the 7/16 20 tap but the hole is to small ,but it is to big for a 3/8 tap,Iam thinking of drilling it out and retaping it to 7/16 20 .I worry about the balancer coming off at 6500 and wreeking havoc under the hood.
also Iam running a 4 speed(imagine that!)and car will be driven hard.

tell me what you guys think of the retap

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post #8 of 9 (permalink) Old May 3rd, 01, 04:30 PM
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It should be 7/16 20 are you sure someone didn't beat on the end and smash it flat. Try a starting tap and be real carefull.

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post #9 of 9 (permalink) Old May 4th, 01, 01:27 AM Thread Starter
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drilled it out and retapped it!
It's all togather now ,just minor stuff let to do .
but wouldn't you know I have to work away from home this weekend!

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[This message has been edited by 4 speed (edited 05-04-2001).]
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