Replacing just the rockers, and rods?

[Sidewinder CC]

I've been looking for aftermarket push rods and can't seem to find pushrods of the FSM spec length.

Spec length is 9.640 - 9.660.

Elgin, Melling, and others are too short. Sealed Power are 9.641 but I won't use their products. Besides, with high milage engines we would be better off with the 9.660 rods to gain some lifter preload on worn cam lobes/lifters. Even OEM rods may be on the 9.640 side so getting the long rods may be a pipe dream. I might go with OEM pushrod and be done with it.

Speaking of Sealed Power rockers, ran accross this stroker website were someone was asking about rocker arm wobble. Seems as though he had problems with Sealed Power rockers. :laugh:

http://www.jeepstrokers.com/forum/viewtopic.php?f=15&t=3564

 

[Sidewinder CC]

Sent emails to Elgin inquiring about the length of their pushrods for the 4.0. Here's the conversation that went on.

My Q: Why are Elgin push rods for Jeep 87-06 4.0 L engines
6.638" long when factory specs are 9.640"-9.660" long?

Elgin A: PR-437 9.638" long

My Q: I know the Elgin PR-437 pushrods are 9.638" long, I see that in your catalog. My question was why are they 9.638" long for the Jeep 4.0 engine when the factory specs for the engine are 9.440 to 9.660 " long. Why would I buy a push rod that is too short?

Elgin A: The spec you listed 9.640-9.660 is theoretical length.
Elgin’s specs are measured length. There is a difference of .024 between measured and theoretical length. ( .012 on either end)

My final response: Are you saying Elgin measured a representative number of new OEM push rods and determined that the average length was 9.638". I wonder why the engineers that designed the 4.0 engine theorized that 9.640"-9.660" pushrod length was actually required.

~~~~~~~~~

Actually, I'm not interested in this dildo's answer.

 

[Ecomike]

I've been looking for aftermarket push rods and can't seem to find pushrods of the FSM spec length.

Spec length is 9.640 - 9.660.

Elgin, Melling, and others are too short. Sealed Power are 9.641 but I won't use their products. Besides, with high mileage engines we would be better off with the 9.660 rods to gain some lifter preload on worn cam lobes/lifters. Even OEM rods may be on the 9.640 side so getting the long rods may be a pipe dream. I might go with OEM pushrod and be done with it.

Speaking of Sealed Power rockers, ran across this stroker website were someone was asking about rocker arm wobble. Seems as though he had problems with Sealed Power rockers. :laugh:

http://www.jeepstrokers.com/forum/viewtopic.php?f=15&t=3564

I am still thinking this through. Just dawned on me that valve seat and face wear would compensate for rod, rocker assy, lifter and cam lobe wear.

 

[Ecomike]

Sent emails to Elgin inquiring about the length of their pushrods for the 4.0. Here's the conversation that went on.

My Q: Why are Elgin push rods for Jeep 87-06 4.0 L engines
6.638" long when factory specs are 9.640"-9.660" long?

Elgin A: PR-437 9.638" long

My Q: I know the Elgin PR-437 pushrods are 9.638" long, I see that in your catalog. My question was why are they 9.638" long for the Jeep 4.0 engine when the factory specs for the engine are 9.440 to 9.660 " long. Why would I buy a push rod that is too short?

Elgin A: The spec you listed 9.640-9.660 is theoretical length.
Elgin’s specs are measured length. There is a difference of .024 between measured and theoretical length. ( .012 on either end)

My final response: Are you saying Elgin measured a representative number of new OEM push rods and determined that the average length was 9.638". I wonder why the engineers that designed the 4.0 engine theorized that 9.640"-9.660" pushrod length was actually required.

~~~~~~~~~

Actually, I'm not interested in this dildo's answer.

Maybe the PR-437 was not made for our engines, and is just close enough to use.