I didn’t see a Volcano sign today?
a couple pics…A 55 Pontiac.. @tRustyK5
a couple pics of Schroeders 872… those pushrods looked to be 3/4” diameter!
smaller pushrods are street w 1.5 rockers, big ones are race w 1.9 rockers.
It was on the left side fence facing the track, so it wasn't in view of the cameras.
Pushrods are one of those things they say you can't have too big, as long as it fits. It's on the lifter side of the rocker so weight is not as big of an issue as valve and retainer weight, etc. Stiffness is more important than weight since there is so much leverage on it from the rocker ratio multiplying the valve spring force. Most engines can't fit a pushrod that big, but you also don't need a 3/4" pushrod for a hydraulic roller at 6K either. Shaft rockers open up the doors though since they eliminate a guideplate, so you can run tapered pushrods or whatever you want.
Have fun today, I'll have the race playing on the stereo while I work on some intakes!
Spent most of last night and this morning with a headache. Didn't figure the drags were the best place for it.