Daves69
Well-Known Member
Maybe from the dies as they spin around the rod during straightening..........There are also spiral serrations running the
full length.
Maybe from the dies as they spin around the rod during straightening..........There are also spiral serrations running the
full length.
Knew about the solids being factory. NeverI meant the full length of it, maybe next to a straight one.
That’s a factory pushrod.
They’re actually “rods”, as in solid, instead of tubing which is what the aftermarket will usually be.
Thanks. I'll check them.If you can try to see how much you can depress the valve. I’ve seen Pushrods bend because someone used the wrong stem seals. If the top of the seal where the stem goes thru is too thick it can cause a bind. Maybe this builder was using seals from a studebaker or something that calls for a really thick top. I used to work in a large rebuilder shop and we kept tons of different spec seals. You would be surprised what I’ve seen shops do to save a Buck.
Thanks,If you can try to see how much you can depress the valve. I’ve seen Pushrods bend because someone used the wrong stem seals. If the top of the seal where the stem goes thru is too thick it can cause a bind. Maybe this builder was using seals from a studebaker or something that calls for a really thick top. I used to work in a large rebuilder shop and we kept tons of different spec seals. You would be surprised what I’ve seen shops do to save a Buck.
I am putting in a Isky 292 Mega with .505 lift. Thanks for the info.I'm using the Summit 6401 cam that has a .488 exhaust lift. No problem with stock valve guide boss height and using positive lock valve seals. (I cut the bosses for these seals but not the height.)
View attachment 1264622
The way I measured preload is to take a straightCheck the amount of lifter preload with the current pushrods...... buy new pushrods in a length that will improve that situation if deemed necessary.
One of the old hollow pushrods can be sacrificed to make it an adjustable checking tool.
My apologies for not replying sooner..Which valvetrain components do you have? Im having the same issue almost like a lifter tick. I have the Comp ProMag rockers which Comp says approximately .030 side clearance. Im thinking that is the noise Im hearing , I just dont know how much lateral movement those actually have during operation.
Thanks PRHeads.What does that .030” preload become if you swap in a bent pushrod in place of a straight one?
My guess is...... you found the source of the noise.
What I meant was, put a straight edge on the valve stems. They may have used different size pushrods to make up for differences in height.
Did that. All valve stem tips are even.
Thanks PRHeads.
Just what we're going to do. Found something
else that may raise some concerns. It looks
like the tops of some of the valves have been
ground off. Going to check the valve heights.
Perfect. That was quick.Did that. All valve stem tips are even.
My thought was if they sunk a valve by grinding the seat or valve face, the retainer would be raised over the non sunk valves. The spring would be shimmed on the bottom but the retainer height would indicate a sunk seat.