The Grumpy Grease Monkey mechanical engineer.
can i install a set of roller rockers,1.6 ratio in my l79 engine with having my pushrod holes elongated to accept the 1.6 ratio?
Grumpy? can i install a set of roller rockers,1.6 ratio in my l79 engine with having my pushrod holes elongated to accept the 1.6 ratio? https://www.hotrod.com/articles/roller-rocker-ratio-test/...
this is an old post I got asked to repost, naturally the first step is to install and correctly degree in your cam, http://garage.grumpysperformance.com/index.php?threads/measuring-piston-dome-volume.17255/...
Guys, I went from an incorrect length (8.950) to a correct length (9.034) pushrod. Does that change valve to piston clearance? I compensated for the shorter pushrods with the lash adjuster screw. In fact I "compensated right out of oil circulation" with T&D Rockers. Now that I have the correct...
you might want to read thru these links and sub links it will help you avoid costly mistakes http://www.summitracing.com/parts/pro-66830/overview/ https://www.harborfreight.com/multipositional-magnetic-base-with-fine-adjustment-5645.html...
How do you determine the spring pressure needed to keep the valves under control for a given lift, duration, and max rpm. It might take you several hours to read thru all the links and sub links but its time very well spent as it could save your engine from destruction and save you thousands of...
Put vortec heads on my L98 and ordered 1417 1.52 Roller Rockers and 7808 Pushrods from CompCams. Installed screw in rocker studs with guide tool before assembly of the engine. Checked valve geometry and the roller left a mark right on the center of the valve like its supposed to. Oil pressure...
How does Rocker Raito affect LCA? To narrow it down we have a 30 over 327 461X heads with the 1.94 valve & flat top piston w/ two valve depressions. The cam has a 112 LCA - Maybe a little wide...
If your thinking you can swap to the 1.6:1 rockers without checking clearances carefully, ...probably not, your certainly going to need to check and verify clearances , and yeah, youll find a dozen guys that say they did it with zero problems......many could also tell you that in a few months they experienced a cam lobe /lifter or rocker failure as the push rod binding in even only part of the rockers arc, tends to cause excessive wear on the valve train, it might take some time but it will result in component failure over time if parts can,t move freely as designed.
youll want too use a .060 clearance too the push rod to cylinder head slot clearance CHECKED CAREFULLY OVER THE FULL ARC OF THE ROCKER TRAVEL FOR A FULL TWO ENGINE ROTATIONS
if you need a LOUIS TOOL to lengthen the slots in the cylinder head I generally lay a section of plastic wrap in the lifter gallery and be sure to place two magnets on the blocks lifter gallery wall, to hold the thin plastic wrap in place firmly, below the cylinder head while drilling to catch the metalic debris the drill will generally produce, between the plastic sheat and the magnets youll generally catch 100% of the trash the drill generates
btw place a magnet like this under each pushrod slot to catch the drill chips from iron heads
These Proform pushrod slotting tools are designed to elongate the pushrod slot in the cylinder head. They will make room for higher ratio rocker arms. Use these tools with a drill and a 5/16 in. drill bit to elongate the pushrod slot.