mopar performance rocker shafts?

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jeff schwarz

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Hi, Can someone please tell me if mopar performance p4510636 is the correct number for a hardend chrome shaft for use with heavy duty stamped steel rocker arms? ( NO BANANA GROVES) all the on line pictures show them with the groves.
Thank's Jeff.
 
I can tell you in 1-2 days when my set of that PN arrives.

If the banana grooves do not extend beyond the inside edges of the stamped rockers, I don't see where it would matter to have the grooves or not. The oil will want to take the path of least resistance, and flow out of the hole and into the stamped rockers' slots rather than spread in the groove.
 
nm9stheham said:
I can tell you in 1-2 days when my set of that PN arrives.

If the banana grooves do not extend beyond the inside edges of the stamped rockers, I don't see where it would matter to have the grooves or not. The oil will want to take the path of least resistance, and flow out of the hole and into the stamped rockers' slots rather than spread in the groove.
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Thank you, I just know that mopar made both, and was hoping that someone could look it up in the mopar performance A engine manual, I know it is listed in there but I no longer have the manual.
 
I don't see where it'd make a difference either way. Since the stock paddle rockers are not sealed to the shaft (by ANY means LOL) oil is going to go past them even if the banana grooves are inside the sides of the rockers. I wouldn't worry "about that" either way.
 
agree with rusty
BTW get the shaft from Rocker Arm Specialists/ Rebuilders in the Redding nor cal area
Whey they say they are hard chromed they mean grind/ copper/ nickel/ grind/ chrome finish grind the nickel is the key, hard- chrome itself does not have to be thick if the nickel is right
chrome does not stick directly to steel
flash chrome is a fraud- merely a rust proofing and break in aid (on valves too)
and you do not want chrome on needle bearing trunions- you want deep heat treat (not flame or induction hardening- )
so match your shafts with your rockers and if roller tip rockers and of long valves relocate the shafts to get the geometry right
 
jeff schwarz said:
Yes please do.
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1 shaft arrived ...... [drum roll please]... no banana grooves.

Interestingly:
  • The bolt holes in the bottom are all the same size. My older rocker shafts have smaller bolt holes in the 1, 3, and 5 bolt positions.
  • There are no notches in either end for orientation.
  • End plugs are there... I'll probably R&R them to check for cleanliness inside the shafts.

Now I gotta call JEG's and ask why they shipped just 1 when I paid for 2! Rrrrrrr....
 
New part, not NOS. JEG's just did not put one of them in the box! No holes in the box, taping all perfectly intact, 2 shown on the invoice.... just someone asleep in the shipping dept. All out of stock again right now, but JEG's says there is another shipment coming in on Feb 18.

Good that I am not in a big hurry...
 
The 4th hole was larger in your old shafts where the oil comes up the pedestal and the pedestal has a slight scallop for the oil to enter the shaft. The oil should come up into the shaft with the clearance between the shaft opening and the bolt diameter. It may be that all 5 holes on the new shaft are larger than the four smaller ones on your old shaft so you do not see the difference. You can always measure the difference between the bolt diameter and the shaft hole to compare to other set ups if it concerns you. I do not know the recommend clearance if there is one off myself.
 
Rocket said:
The 4th hole was larger in your old shafts where the oil comes up the pedestal and the pedestal has a slight scallop for the oil to enter the shaft. The oil should come up into the shaft with the clearance between the shaft opening and the bolt diameter. It may be that all 5 holes on the new shaft are larger than the four smaller ones on your old shaft so you do not see the difference. You can always measure the difference between the bolt diameter and the shaft hole to compare to other set ups if it concerns you. I do not know the recommend clearance if there is one off myself.
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The older shaft holes are .375" at the 2nd and 4th holes.. where the oil comes up. The 1, 3, and 5 holes are smaller, like around .33-.34"; they should register the shafts more accurately than the new shafts, where all 5 holes are .375". Oiling-wise, bolt-to-hole clearance is the same old to new; it is just the accuracy of registration on the heads is better with the older shafts.

I'll have to set it on a head to see if the looser registration could allow you to mis-register the new shaft enough to where it blocks up the oiling hole in the rocker stand to any degree. Maybe not a big deal; more of an observation.
 
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