COMP Cams Ultra Pro Magnum XD Roller Rocker Arms User Manual
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COMP Cams®
3406 Democrat Rd.
Memphis, TN 38118
Phone: 901.795.2400
Part #151
Revised 7/9/14
Toll Free: 1.800.999.0853
www.compcams.com
Most 1991 and newer 454-502c.i., Gen V & Gen VI engines, will need to have screw-in studs installed to run these
rocker arms. COMP Cams
®
Part #4514-16 rocker stud kit will allow installation of screw-in studs without machining.
Chevrolet
1955-Present 265-400c.i., 1978-1990 V6 200-262c.i.
Engines using 1.6 ratio rockers should be checked for clearance between the pushrod and pushrod slot in the cylinder
head. The pushrod slot may need to be elongated. Part #4710 (the Louis Tool) can be used with a 5/16" drill bit and a
hand drill to provide extra clearance. We recommend removing the cylinder head to prevent metal shavings from
contaminating the engine. An alternate method is to install screw-in studs and guide plates, then drill the guide holes to
1/2" diameter.
Part #’s 1601, 1602, 1604, 1605, 1801, 1802, 1804 and 1805 are not self-aligning. Guide plates and heat-treated
pushrods will need to be used to install these rockers on 1988 and later engines originally equipped with self-aligning
rocker arms. Valve cover clearance should also be checked in these applications.
Part #’s 1617 and 1618 are self-aligning. Do not use with cylinder heads that have pushrod guide slots or pushrod
guide plates. Severe wear could occur. Check valve cover clearance.
For high lift (.500"+) applications, longer pushrods may be required to correct rocker arm geometry. Remember, valve
tip height, block deck height, cam base circle and head surface all affect pushrod length required.
Part #’s 1607, 1608, 1609, and 1610 are designed with a special offset trunion to allow for use on the intakes of Trick
Flow Twisted Wedge Small Block Chevrolet cylinder heads.
Ford
1962-1997 V8 289, 302 & 351Wc.i.
Part #’s 1631, 1632, 1831 and 1832 may be used on long or short tipped valves, but must have guide plates or guide
slots in the cylinder head to maintain rocker arm alignment. Most 1978 and later 302, 302H.O., and 351W engines
have a cap screw (bolt) that holds the rocker arm in position. In these applications, the cylinder heads must be
converted to screw-in studs and guide plates when installing your rocker arms.
Some 1985 and later engines are equipped with hydraulic roller cams and use special length pushrods. Be sure to use
the correct pushrod.
Some 1967-1977 engines come with tapered (bottleneck) studs, 3/8" bottom and 5/16" top. These will have to be
removed and replaced with screw-in studs and pushrod guide plates.
For high valve lift (.500"+) applications, longer pushrods may be needed to correct rocker arm geometry.
Ford
1970-1982 351C; 351-400Mc.i. & 1968-1997 429-460c.i.
Part #1630 and 1830. Screw-in studs and guide plates will be required to install Ultra Pro Magnum™ or Ultra Pro
Magnum™ XD Roller Rockers on these engines. Check rocker arm geometry, as longer pushrods may be needed.
Limited Lifetime Warranty