I need to adjust my valves i am unsure on the correct feeler gauge? 289 aluminum heads gty303 solid lifters clay smith 302 cam
It is specific to each cam. Mine is .22 HOT but yours could be quite a bit different. It is listed on the cam card if yu still have.
Yep, you will have to contact the manufacturer to get the specs. If you adjust them wrong you risk wear on the cam or damage to the rockers and valves.