Small Block Or Big Block Chevy 3/8" top x 7/16" lower with or w/o guide plates - Professional Series

ARP High Performance and Professional Series Rocker Arm Studs offer improved reliability through longer thread engagement in the cylinder head and an extra large radius for reduced flex. Special applications have been designed for aftermarket heads to assure proper fit. High Performance Series are rated at 170,000 PSI while Professional Series are rated at 190,000 PSI.

34790 Westerbeke Heat Exchanger. Used on Westerbeke 46 / 15.0 BTD - 60 Hz / 12.0 BTD - 50 Hz Cooling System. 3" Diameter x 16" long.
Replaced by Westerbeke 36898.

34790CN Westerbeke Heat Exchanger. Used on Westerbeke 46 / 15.0 BTD - 60 Hz / 12.0 BTD - 50 Hz Cooling System. 3" Diameter x 16" long.
Replaced by Westerbeke 36898.

WASHER Mercruiser 525-12-34714

SLEEVE Mercruiser 23-47471T

Supersedes 23-47471

Supercedes: 23-47471

BRACKET-LIFTING Mercruiser 862347T

ARP Rocker Arm Studs, 7/16" - Typical SB application

If you have ever installed a rocker stud into a cylinder head and watched it wobble as it screwed in - you knew from the beginning that the rocker geometry was going to be inconsistent all over the place. ARP rocker studs are concentric within .005 T.I.R. thread pitch to thread pitch. They run-in straight and true. Lengths are exact - designed to provide positive seating every time. An extra-large radius base offers greater resistance to flex. Available in both High Performance and Pro Series models.
NOTE: Not to be used with OEM-style, self-locking nuts. To be used with ARP's patented Perma-Loc adjusters

SB Chevy Rocker Arm Studs, with Roller Rockers & Stud Girdle

If you have ever installed a rocker stud into a cylinder head and watched it wobble as it screwed in - you knew from the beginning that the rocker geometry was going to be inconsistent all over the place. rocker studs are concentric within .005 T.I.R. thread pitch to thread pitch. They run-in straight and true. Lengths are exact - designed to provide positive seating every time. An extra-large radius base offers greater resistance to flex. Available in both High Performance and Pro Series models.

NOTE: Not to be used with OEM-style, self-locking nuts. To be used with 's patented Perma-Loc adjusters IMPORTANT TECH NOTE
It is highly advisable to determine what the optimum rocker arm stud length is for your particular application. This is especially true when "long" pushrods and valves are employed - you should raise the "installed height" of the rocker arm to compensate for the longer-than-stock components.

Exhaust Manifolds

Description: Center rise manifold, Application: OMC/Volvo Ford V8

Sold: Each