COMP Cams, Inc.®
for serious street performance, bracket racing, super classes, & circle track racing


Pro Magnum Roller Rocker Arms™
Before we introduced our revolutionary Pro Magnum Rocker Arms™ there were only two alternatives in competition rocker arms: Stainless Steel for strength and reliability or Aluminum for light weight and low cost. With the Pro Magnum Rockers™ you get the best of both worlds.
Pro Magnum Rockers™ are made of 8650 chromemoly steel. This material is some three times stronger than 7075-T6 aluminum which is used for most aluminum rocker arms. Our engineers used advanced computer technology (including Finite Element Analysis) to refine the Pro Magnum Rocker™.
We added strength where it was needed and reduced mass in low stress areas. The result: Pro Magnum Rocker Arms™ have less weight (5%) at the valve than most aluminum rockers. This means more RPM and valve train stability.

The unique design of the Pro Magnum Rocker™ enables us to use a larger trunion with more needle bearings. This spreads the load more evenly and the rocker will last longer. Other features include an integral pushrod seat that insures accuracy and saves weight, a unique rocker design also provides plenty of clearance for most high performance valve springs.

Ideally suited for serious street, bracket racing, super classes, and circle track racing. You won't find a better street rocker for the price.

Unlike aluminum rockers, this heavy duty rocker can be rebuilt. We will disassemble and inspect it, then replace the roller tip, axle, trunion and bearings to make your rockers like new.

Lifetime Guarantee!
Pro Magnum Rocker Arms are so strong that we guarantee the rocker bodies for life against breakage.

Part # Application Rocker Stud Ratio
*1301-16C Chevrolet V8 265-400 3/8" 1.52
*1301-12B Chevrolet V6 200-262 3/8" 1.52
*1304-16B,C Chevrolet V8 265-400 7/16" 1.52
*1304-12B Chevrolet V6 200-262 7/16" 1.52
*1302-16C Chevrolet V8 265-400 3/8" 1.6
*1302-12B Chevrolet V6 200-262 3/8" 1.6
*1305-16B,C Chevrolet V8 265-400 7/16" 1.6
*1305-12B Chevrolet V6 200-262 7/16" 1.6
1308-8 Chevrolet V8 265-400
Twisted Wedge Head, Intake Valve
7/16" 1.52
1309-8 Chevrolet V8 265-400
Twisted Wedge Head, Intake Valve
7/16" 1.6
1317-16 Chevrolet V8 1988 & later
with self aligning rockers
3/8" 1.52
1317-12 Chevrolet V6 262 1988 & later
with self aligning rockers
3/8" 1.52
1318-16 Chevrolet V8 1988 & later
with self aligning rockers
3/8" 1.6
1318-12 Chevrolet V6 262 1988 & later
with self aligning rockers
3/8" 1.6
*1320-16A Chevrolet V8 396-454 7/16" 1.7
1330-16 Ford V8 Boss 302, 351C, 429-460 7/16" 1.7
1331-16 Ford V8 289-302-351W 3/8" 1.6
1332-16B Ford V8 289-302-351W 7/16" 1.6
*1321-16D Chrysler V8 B/RB shaft 1.5
1077-1 Shaft for 1321 rockers N/A N/A
1077-2 Shafts for 1321 rockers N/A N/A

Pro Magnum Roller Rocker Arms
Call 1-800-999-0853 For Sales

  • Rebuildable
  • Light Weight
  • Strong 8620 Chromemoly Steel
  • 5% Less Weight At Valve Than Most Aluminum Rockers
  • Large Trunion & More Needle Bearings To Spread The Load
  • Integral Pushrod Seat
  • Plenty Of Clearance For Most High Performance Valve Springs
  • Lifetime Gaurantee
  • Applications Include Serious Street, Bracket Racing, Super Classes, & Circle Track Racing
  • Chart Footnotes:
    A. Will not replace late model pedestal rockers. See page 285 for stud conversions.
    B. Must use screw-in studs and guide plates
    C. Will not replace late model rail rocker
    D. Requires a ball / ball pushrod

    Note: Rockers available as singles, half-sets and full sets.

    *50-state legal for 1993 and older GM vehicles equipped with 200 c.i.d. (4.2L) to 454 c.i.d. (7.4L) gasoline engines. C.A.R.B. E.O. #D-279-4.

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