Ultra Pro Magnum XD Rocker w/ 1.8 Ratio for Chevrolet Big Block w/ 7/16" Stud Clamps it includes a 4140 Heat

it includes a 4140 Heat Treated Adjuster for durability and a powder coat finish

Lope at idle with extremely good top end power

where the Berserker now gives the street/track enthusiast a “streetable” performance valving tuned to their specific use and vehicle

or straight out the back under the rear bumper for a muscular look

This kit contains all the necessary parts top replace the factory head bolts

Ultra Pro Magnum XD Rocker w/ 1.8 Ratio for Chevrolet Big Block w/ 7/16" Stud Clamps it includes a 4140 Heatthese Ultra Pro Magnum XD rockers can handle up to 1,000 lbs of spring pressure. This 1828 rocker features a 1. 8 ratio for use with 7 16" stud Chevrolet 396 454 Big Block.