Senior Tech Team
Join Date: Sep 1998
Location: Mustang, OK USA
Re: Balancer and Steering
All Chevy small block harmonic balancers (except 1955-56) have the same 3-bolt pattern on the spokes for attachment of ANY pulley (1-2-3 groove).
The 307 engines which I am familiar with that had pwr str, had a 6in balancer. The 350 engines that I'm familiar with had an 8in balancer----------------AND WILL NOT CLEAR THE STOCK 307 PWR STR PUMP BRACKET.
Soooooooooo, what we did when replacing a 307 with pwr str, to a 350 with 8in balancer, was to slightly modify the lower PS pump bracket by notching it and then welding a piece of flat steel to reinforce it where it had a section cut off.
Below is a PS pump bracket from my son's 68 that had a 307 and we modified it to clear the larger 350 balancer.
The first picture is the modified bracket.
The second picture shows where an area was cut out (red pencil) and the steel plate that was welded in for support (blue pencil).
The third picture shows how the larger 350 balancer will now clear the PS pump bracket.
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