I've got a 455 Olds.............#5001 Harland Sharp Roller rockers......ARP Rocker stud installation or pedestal #134-7104(7/16-14tpi base that fits into the head and a 3/8" by 24 tpi that is too small to fit in the Harland Sharp hexhead lock nut. What ARP pedestal/ Rocker installation stud do I need???
Harland Sharp is closed Friday 11:00AM until Monday morning EST.
Thanks
joepenoso

 

Not really rocket science here. If you google "5001 Harland Sharp roller rockers" you get this:

Sounds like you need a stud that's 7/16" on both TOP and bottom. Should be about a million sources of those.

 

Thanks for your time and speedy responce...........

"Sounds like you need a stud that's 7/16" on both TOP and bottom. Should be about a million sources of those. "


You're right there are 19 different pedestal rocker studs 7/16" inch top and bottom at ARP alone. All of them or some of them might fit and work with Harland Sharp roller rockers # 5001...I wonder which one???
Thanks
joepenoso

 

The problem is that the exact length will depend on your engine's specific valvetrain geometry, pushrod length, and how much the heads have been cut. That's why studs are available in roughly 0.10" length increments. With the lifter on the base circle, set the rocker on the pushrod and valve tip and measure the distance from the top of the guide plate to the top of the rocker pivot shaft. Add to that the depth inside the polylock with the lock screw at about the middle of travel. That's how much effective stud length you need. The reality is that there's probably enough adjustment in the polylock that you aren't that sensitive to stud length.

 

Assuming stock length valves......................9.8 inch pushrods................uncut heads.................7/16" UNC. bottom and 7/16 UNF. top thread where does that leave us with just "ARP rocker stud installation bolts" ......................
see ......................
non rocket science isn't that easy
thanks
joepenoso