Every motor I have ever worked on and have seen requires a center bolt. Look in the center and you should see threads. The 350 I just bought somone changed pulleys and the bolt was barely on and if I left it alone it could have fallen out.
The majority of pre-'67 standard output (non HP application) cranks did not have the hole drilled and tapped to accept a damper bolt.
It can be done by any good machine shop if desired. I've even done one with the crank in the car in the garage, but you need to be pretty carefull in lining things up - it's not a job I would likely recommend for the adverage mechanic ...
Early small block Chevy balancers were pressed on with no retaining bolt. The early cranks were not even drilled and tapped for a bolt which means you had no other option than to hammer the balancer on.
The last time I had the 327 apart the machine shop drilled and tapped a hole in the snout of the crank. I can now use a balancer installer instead of a hammer, and I feel better with a bolt in there.
Chevy built about 20 million small-blocks with press-on balancers and no bolt hole; 283's (except some trucks) didn't have the bolt, and the only 327's that did were L-79's and solid-lifter engines. :thumbsup:
Wow! I'm glad I read this often. I was just looking at my engine the other day and thought I was (NOT) seeing things 'cause I could of sworn there was no crank bolt in my balancer! My car is an ealry '67 with a 327. I feel much better. :hurray:
I thought that purchasing my 1967 Camaro Convertible 327 with numbers matching was one of the best decisions I ever made. I guess I was wrong because joining this forum with such a knowledgeable group of guys was actually the smartest thing I ever did. Thanks once again for all the useful information that each of you have provided.
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