You didn’t mention which pushrod which can point to a more specific cause.  When you adjust the valve, take note if the adjuster is sitting lower than the rest.  If it is, there’s a chance the cam lobe and/or lifter is going away and the excess in lash is why the pushrod decided to jump out of place.  Other things that can contribute to the aforementioned pushrod problem includes varnished valves (old fuel), pushrod rubbing within the hole in the head, lack of oil at the rockers, or over-reving the engine.  If the bolts are too long at the very front of the intake or too long in the unused threaded holes directly behind the intake, then those 'too long' bolts can simply lever the pushrod out of place.

Lorena, Texas (South of Waco)

Well, the NAPA part SEP RP3022 (same item as part # 215-4048 suggested above) was a bit longer or shorter (I can't remember) than mine, plus it was bigger around and the shape "cup" at the top was also slightly different...

so, guess I'll try Concours or Dennis Carpenter...

any other sources out there that anyone can suggest?

Mark

"God Bless Texas"location: Houston,TX

Speaking of push rods. I've been wondering for a while if the difference is longer push rods for the heads with the oil diverters under the rocker stands. Is the thickness of the diverter about the same as the difference in pushrod lengths? Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Mark.  What is the effective length pushrod you are needing?  I’ve bins full of stock used pushrods here in the various Y lengths.

 

Chuck.  While the oil baffles are a consideration for the rocker arm geometry, it’s not a model year qualifier for the pushrod length.  Seems the later model pushrods were the same lengths as the early models which rules out the oil baffles being what determined the pushrod length.

Lorena, Texas (South of Waco)

Ted, thanks for the offer...

using a plain ole ruler, my rod is 8 1/4 inches long...

or 21 cm...

bear in mind it has a very slight bend, so that might make it a hair or two longer.

does that sound standard?

Mark

"God Bless Texas"location: Houston,TX

Mark.  I do have some stock pushrods here that measure 8¼“ overall length.  These particular pushrods are 8.100” effective length and are the ¼” diameter units.  While overall length can vary due to cup depth, effective length is a constant.  Different manufacturers will have different cup depths which is why this is important.  Effective length is measured by placing a ball of a known diameter in the cup end of the pushrod, measuring the overall length with the ball in place, and then subtracting the ball diameter.  Just let me know exactly which pushrod and I’ll get a couple in the mail once you email me your shipping address.  My contact info is at www.eatonbalancing.com  .

Lorena, Texas (South of Waco)

Ted, again thanks for the offer of assistance;

not sure how to get my hands on a ball to place in the cup so I can do the calculation you describe...

any suggestions on that item?

"God Bless Texas"location: Houston,TX

Ted,

I just sent you an email msg to your work email.

thanks, Mark

"God Bless Texas"location: Houston,TX

hot-cha-cha-cha!

thanks to the generousness of a fellow-forum member in Texas, four push rods arrived this afternoon.

Just installed a replacement one, using the "oil and then whack the valve to make sure its not stuck..." step as mentioned earlier; then pulled the coil wire off and bumped the engine to make sure the rod/rocker actually moved as it should, and SUCCESS!

Of course, the battery was too low to actually start it, so back on went the charger...

we'll see in a few if the "chug, chug, chug" is gone!

thanks to all who jumped in with suggestions!

Mark 

"God Bless Texas"location: Houston,TX

Started right up!

But I've noticed that a few of the push rods do not rotate, and a few do not seem to be getting oiled...

This can't be good, right?

"God Bless Texas"location: Houston,TX