Datsun Roadster Forum-311s.org

Stock Pushrod shows 7.83" length
Isky D-013 Pushrod shows 7.687" length
Racing Prep Manual says cut .250" from stock pushrod (with cut head) or 7.58"

I was expecting a pushrod length close to the Isky D-013, measuring it with an adjustable pushrod (Comp 7709-1) I am getting 7.493"

Thanks,
Daryl

Irrelephant

I run Isky shortened ones that go with the Ford lifters in my #13 FP 1600 racecar.

I wounder if the rocker is designed to run off center just a little. I remember something about that causing the valve to spin that keeps it clean.

fj20spl311 wrote: ↑Thu May 11, 2023 4:02 pm I wounder if the rocker is designed to run off center just a little. I remember something about that causing the valve to spin that keeps it clean.

I believe it's the lifters that are caused to rotate, by the angle of the wipe areas of the cam lobes....I could be wrong...

That’s correct the lifter has to rotate or the cam will go flat and the lifters will become dished on the rubbing surface as it continues to wipe in the same spot.
Dave

Irrelephant

Do you have the supplier for the roller rocker ?

For Sure the lifters have to rotate, but I heard the valves are also designed to rotate.
That is why the keepers are designed to fit loose on the valve and tight in the valve retainer.
I Don't know?

There are videos taken inside an engine with high speed cameras that show the valves rotating. Pretty cool stuff.

Irrelephant

Irrelephant