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Hydraulic Roller Cam - Wake-Up 'Stick



Hydraulic Roller Cam
Though we've said it before, it bears repeating-when switching from a flat-tappet to a roller cam, you must use a thrust button to limit cam endplay. We picked up this slick setup with our other Comp goodies, which included a new Magnum timing set. the cover incorporates a welded thrust-plate tab for use with the included needle-bearing- type cam button. We set our endplay at 0.015 inch, right in the middle of the 0.010-0.020 inch Westech recommends.		 Hydraulic Roller Cam
Of course-and we cite the Comp catalog here-the proper length pushrod is the one that creates proper valvetrain geometry. Note the marks left by one of our rocker-arm roller tips when activated by the proper length pushrod-the marks in the dykem show that the roller has moved across the valve tip but remained roughly in the center during its travel. this is the type of pattern you want to see.		 Hydraulic Roller Cam
We showed you proper valvetrain geometry above on an installed valve, but before we got too carried away, we double-checked our piston-to-valve clearance before final installation. We pretty much knew we could get away with our chosen lift figures based on the bigger cam specs that had been contemplated at this engine's inception, but it pays to doublecheck before piston meets valve- right? even with the bigger 'stick, we had 0.175-inch clearance on the exhaust side and an amazing 0.295 inch on the intake.
Hydraulic Roller Cam
Pushrod length must also be accounted for when switching cams- Mena used a tried-and-true adjustable checking tool to determine that we needed 7.300-inch pushrods, which are 0.100 inch longer than what you'd find in a factory hydraulic roller cam setup.		 Hydraulic Roller Cam
Beehive springs have been around for a while now, but the visual difference between them and traditional springs is still striking. Whichever spring you use in a cam swap, it's critical that you follow the manufacturer's recommendations for spring type and setup. Our springs, for instance, specify an installed height of 1.800 inches at 130 pounds-you must check these figures and make sure the springs are 0.060 inch away from the listed coil bind height (1.100 inches in our case) when subjected to your cam's maximum lift.		 Hydraulic Roller Cam
At this point, we still had a good chunk of this engine's top end left to reassemble, but with a fresh set of Fel-pro 1205 intake gaskets laid on and the intake waiting, we stopped to look at our valvetrain handiwork: Magnum retrofit hydraulic roller lifters, pushrods, pro Magnum rocker arms, and rpm-friendly beehive valve springs. Of course, our new high-zoot camshaft is out of sight.
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