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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#15998 03/03/2004 3:38 AM | Joined: Mar 2001 Posts: 259 Member | | Member Joined: Mar 2001 Posts: 259 | The two 283 engines I have were not drilled in the crankshaft for the harmonic balancer bolt.
I did drill and tap one of the crankshafts for the balancer bolt because I added air conditioning. I was told the added pressure from the compressor cycling off and on could loosen the balancer so I added the bolt to prevent that situation from happening.
Joe
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