I never knew there were different rockers depending on pushrod style. That could be the issue then because the car has the tube type pushrods. I do not know if they are original or if the PO installed them. It also has the grooved balls.
One other thing came to mind while i was out digging through my junk.
Once rocker balls and rockers are run for a while,, there are MARRIED for life..
that means they have been working together long enough to get used to each other,, best metaphor i could come up with.....
now ive seen guys rip um off the head and put um all in the parts basket to give um a good cleaning,,,wrong....
it is imposable to mate um up again and sometimes? if your running a stock factory low lift grocery getter,, you can get away with it....
But the best way to use used rocker and balls,, if ya dont have the funds for new, and the OLD ones are 100 times better, is to pull um off the head 1 at a time and string them on a wire as they come off,, that way they stay together when ya put um back on....
and it really dont matter what stud or valve ya put um on ether,, as long as the rocker and ball that are mated stay together....
Also? most of the New rockers ya get at your local parts house are from CHINA,, mexico has better parts......
but any and all rockers i get were from GM,, but they only make the self alining ones,,, all the old style have been discontinued and you will have to drill out the push rod passage in the head or they will bind on the older type of iron heads....
the new aluminum heads already have the holes bored out for the new type of rockers and with the new rockers? also,, you cant run push rod guide plates on the heads,, it will cut the push rod in 2.......
Hope this helps........
