Report 350 Starter Motor in 1965-83 Avanti Posted May 21, 2012 · Edited May 21, 2012 by WayneC Did you (or can you) compare the new starter to the old one? I think Chevy starters are pretty much the same; there are a few different starter nose designs that have been used. If the starter bolts to the engine and the nose of the starter snugs to the space available at the opening of the flywheel (ring gear), then chances are the issue is one of shimming the starter mount... Here is a link to some information on Chevy starters: http://www.crankshaftcoalition.com/wiki/Noisy/grinding_GM_starter_fixes Here is some info I saw somewhere and squirreled away: Re: Starter shims Take the lower sheetmetal shield(s) off the flywheel, so you can see the flywheel teeth from the rear of the flywheel (in the area where the starter gear contacts it). Take the starter off and REMOVE the solenoid (for the moment), the battery terminal wires, and 2 sets smaller wires, plus 3 small bolts to get the rest loose. Remount the starter SANS solenoid. MANUALLY pull the little thing that sits inside the solenoid to the BACK of the starter, this pulls the starter gear into the flywheel. Proper clearance requires BOTH of the following: the bendix teeth should stick through the flywheel teeth, AND, between the TOP of the bendix tooth and the valley of the flywheel tooth, there should be a space NO BIGGER than a straightened out paper clip wire. If there is NO space (the starter gear cannot be extended enough to fully engage the flywheel/ring gear), you need to add a shim or two and retry the paper clip test. If there is a LOT of space (much more than the paper clip wire) and there are no shims currently in place that you can remove, you need a new starter NOSE.