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katy · 10-14-2020, 10:11 AM

I once had a 302 engine that knocked like that for a few seconds. The fellow at the machine shop told me it was piston slap until the pistons warmed up and expanded. I dropped the pan, replaced all the rod shells with .001" undersize (oversize?) shells, knock went away.

10-14-2020, 10:11 AM	#4
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,042	Re: Knocking on start up I once had a 302 engine that knocked like that for a few seconds. The fellow at the machine shop told me it was piston slap until the pistons warmed up and expanded. I dropped the pan, replaced all the rod shells with .001" undersize (oversize?) shells, knock went away. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! Last edited by katy; 10-15-2020 at 09:51 AM.