Pushrod opinion

[Kendog 170]

Swapping from hydraulic to solid cam and lifters. The hydraulic pushrod had a few treads showing under the rockers (perfect) Now with the solids too many threads showing.(see pic) I have these Ford pushrods and there is only 1 thread showing adjusted cold with an 016 gap. Should I run them or go a smidge shorter?

 

[Kendog 170]

I may try rocker shims I have but will need to check the roller to valve stem travel.

 

[PRH]

Going from “correct” Mopar Hyd lifters to “correct” Mopar solid lifters(meaning not AMC lifters), is going to require pushrods that are about .250” longer.
(Pushrod seat height 1.88” vs 1.63”)

Mopar Hyd lifters to AMC solids is about a .100” change.
(pushrod seat height 1.88” vs 1.79”)

The EDM lifters are AMC lifters.

 

[Illahe]

Swapping from hydraulic to solid cam and lifters. The hydraulic pushrod had a few treads showing under the rockers (perfect) Now with the solids too many threads showing.(see pic) I have these Ford pushrods and there is only 1 thread showing adjusted cold with an 016 gap. Should I run them or go a smidge shorter?

View attachment 1716474807

View attachment 1716474808

To me, the top photo seems like the adjustment is in the ball park. I believe 1 1/2 threads is recommended. Defiantly not the bottom photo.

 

[Newbomb Turk]

You want the least amount of thread showing.

However you get that, that’s what you want.

 

[mopowers]

If there's an oiling groove (and hole) in the adjuster, make sure it's lined up with the hole in the rocker body.

 

[Kendog 170]

Well the Ford pushrod shown is 9.500" and I barely see 1 thread. I'm thinking 9.400" would be about right. That should give me 2to3 threads showing.

 

[mbaird]

I may be wrong but does this rule apply when you are using a cup style adjuster ?

 

[Inertia]

Just be sure there isn't any interference between pushrod cup and rocker at max lift. .
Been there .

 

[PRH]

I may be wrong but does this rule apply when you are using a cup style adjuster ?

For rockers with cup style adjusters that oil thru
the adjuster screw(which is pretty much all of them), referencing the number of threads showing on the underside of the rocker is not the correct way of determining the correct adjuster position.

 

[MOPARMAGA]

I have less than 1 thread on my big block. I have ran the same length pushrods with my rockers. Starting from standard thickness deck to .090 milled .
I think it went from 3 threads to 0 now with no real difference in geometry.

 

[Illahe]

For rockers with cup style adjusters that oil thru
the adjuster screw(which is pretty much all of them), referencing the number of threads showing on the underside of the rocker is not the correct way of determining the correct adjuster position.

Can you advise us to the "correct procedure" for setting up cup style adjusters...

 

[mbaird]

For rockers with cup style adjusters that oil thru
the adjuster screw(which is pretty much all of them), referencing the number of threads showing on the underside of the rocker is not the correct way of determining the correct adjuster position.

To clarify… you are saying that most all cup style adjusters oil thru the adjuster ? Not that most adjusters are cup style .

It never occurred to me that I had to line up the feed holes .
Which is probably why I am not getting as much oil flow as I would like on my W2 heads with cup style Harland Sharps ? Make sense .

 

[PRH]

I’m referring to the cup style adjusters as being “oil thru”, at least all that I’ve encountered.

As for proper set up, obviously it’s best to follow the instructions.
For the ones I’ve used the priority is to make sure the adjuster screw is positioned where the oil can actually flow thru it.
Basically, you thread the adjuster screw into the body as far as it will go, then back down one turn.
This is the middle of the acceptable range, and you can go +/- one turn from there.

As NT stated, higher up is generally better than lower.

 

[Kendog 170]

The 9.500 pushrods worked out well. Broke in the cam this past weekend.