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. Manufactured using the correct processes and materials all ARP rocker studs meet or exceed stringent aerospace specifications. High-performance rocker studs are 170,000psi tensile strength while pro-series studs are 190,000psi. NOTE: Not to be used with OEM-style, self-locking nuts.
Application	B	C	D	E	F	Part Number -Hi-Perf.	Part Number -Pro-Series
CHEVROLET, SMALL BLOCK
3/8”	1.750	.700	.800	3/8”	7/16’	AR134-7101	AR234-7201
7/16”	1.770	.700	.670	7/16”	7/16”	AR134-7103	AR234-7202
7/16”	1.900	.750	.850	7/16”	7/16”		AR200-7202
w/roller rockers & girdles	1.900	.750	1.000	7/16”	7/16”	AR100-7101	AR200-7201
3/8” w/roller rockers	1.895	.710	1.000	3/8”	7/16”	AR134-7104*
w/roller rockers & stud girdles	1.900	.850	.850	7/16”	7/16’		AR234-7206*
w/roller rockers & stud girdle	2.100	.750	.800	7-16”-20	7-1/16-14		AR334-7203*
w/roller rockers & stud girdles	2.100	.750	.800	7/16	7/16		AR334-7203*
CHEVROLET, BIG BLOCK
Chevy	1.750	.800	.850	7/16”	7/16”	AR135-7101	AR235-7201
Dart alum. Heads , 16 pcs	2.000	1.3,.820	.750	7/16”	7/16”		AR235-7202*
Alum.heads, exh. studs only,8 pcs	2.000	1.650	.800	7/16”	7/16”		AR235-7203*
Alum.heads, int. studs only, 8 pcs	2.000	.820	.800	7/16”	7/16”		AR235-7204*
Mark V	1.900	.750	.750	7/16”	3/8”	AR135-7102
FORD, SMALL BLOCK
SVO 351ci, w/roller rockers & girdles	3.000	.950	2.100	7/16”	7/16”		AR254-7201*
w/roller rockers & girdles	1.900	.750	1.000	7/16”	7/16”	AR100-7101
PONTIAC
3/8”	1.750	.680	.800	3/8”	7/16”	AR134-7101

* These studs have a shank portion
under hex to locate guideplate.