[screamingchief]

Originally Posted by importsmasher

screamingchief, I understand what you mean shorter valves would require shorter push rods. I guess I didn't explain it correctly. I think I do have shorter valves, becasue there isn't enough adjustment in the rocker arm to take up the slack, so it "seems" like the pushrod is too short, but in reality, I need to be able to adjust the rocker arm lower to take up the slack.

Thanks again,
Importsmasher

I get what your saying Is,but how your saying it is a bit confusing here.

Apparently me & Bill were more concerned about explaining the IH ~ valve length relationship.

See it's entirely possible to have a shorter valve length with the stock IH.

Vice-versa is true as well,you can have a longer valve with the stock IH.

Also you can have a stock length valve with a shorter/taller IH.

Or any combination therein.

Thus you cant rely 100% on the IH to determine the valve length.

IH is relative to the combination of parts being used in the valvetrain assembly.

Only way to be 100% certain of the valve length is to pull down a head and actually measure the valve(s).

Now anything that would move the rocker arms fulcrum height could affect this as well.

Are we 100% sure those #46 heads are indeed from '74?

I ask as there is an earlier pressed stud #46 head casting ('69 290 hp 400 cid).

Anything under the rocker studs other than the guideplates??

Not using thicker than stock head gaskets???

Odds are the adjustable valvetrain will fix the problem,but it never hurts to figure out why that is so.

Bret P.