I am using 91 octane pump gas.....I'm starting to think this is a high compression motor....I didn't build it,the truck came with it in the doghouse.....a 10-12 deg distributor bushing for my msd pro would be great if I could find one BTW I am using rn9yc plugs,hoping a cold plug would help?

Last edited by mopartuner; 09/30/23 05:20 PM.

410 pump gas solis flat tappet cam 10.95 so far