what diameter are the stock rocker studson an 89 305 5.0 TBI v8? 3/8 or 7/16? it got the centerbolt heads and i know i need the narrow body self alineing rocker and i wanna get roller rockers but need to know the stud size as im too lazy to pull my valve covers and check...help?

 

Stock studs are going to be 3/8. Its on the screw in studs that the part that threads into the head may be 7/16. And that is only on the side under the hex. Its 3/8 on top where the rocker goes on.

 

sweet, thanks madmike

 

Any time