Before actually installing the cam check that every lifter rotates freely in its respective bore. Try adjusting your rockers, Im willing to bet thats both of your problems. Hydraulic lifters should be adjusted from one-half turn to a full turn from zero lash depending upon lifter manufactures (or cam manufacturers) directions. <> Even today’s “high zinc” oils lack the right additives to withstand the abuse.

If it is less, the guide must be machined. if a cam is hard enough to begin with why do you have to offer an extra hardening service over a p 55 core which is still les money if used. If nothing else leads to its downfall, a profile ground on a good core can have a hydraulic intensity of 50° – 55° and be a pretty safe bet in terms of reliability.

The valve train is an intricate system of perfectly timed moving parts under great stresses and high RPM. To make sure that the system works as it should first measure each lobe on the cam you intend to install and check that it has at least one thousandth taper across the lobe (1.5 to 2.5 are typical). This is a 1973 454 engineIf the engine gets into valve float you will sometimes pop the retainer clips out of the groove and then you have other issues come along with it.When the retainer clip is missing or broken on hydraulic lifters, the culprit is "usually" incorrect adjustment. Floss all crank oiling holes and rinse out pushrods, even if they are new.Cams, lifters and bearings rely on a microscopic film of lubricating oil to keep them from galling, and any debris or grit suspended in the oil becomes an abrasive that quickly destroys their surfaces or gets stuck within the close clearances. HTH SHARE POST #21. Posted using the Full Custom H.A.M.B. My intent here is to show how to minimize the flat tappet cam failure primarily seen with domestic V8s. Make sure they are the right ones for the job and work with the cam and cylinder pressures.The pushrods are the longest gap in the valvetrain and usually the first to distort. Jump to Latest Follow 1 - 20 of 30 Posts.

If there are friction modifiers, as in regular oil, the rings won’t seat. Lunati’s new Voodoo range is a prime example here and recent tests in a big block Chevy showed they certainly delivered as promised.The problem of wiping out flat tappet cams could be prevented by going to a roller design. Just wonder if anyone else out there have had any problems with Comp cams hydraulic roller lifter s? An ideal break-in seat pressure is around 80 lbs and not exceeding 100 lbs. Replace the oil and filter after the break in and again after 500 miles.For more detailed instructions, read COMP Cams Installation Instructions, Part No. Make sure all used and new components work together and are within spec.Check the camshaft play where necessary, as well as the position of the lobes in the bores. Make sure they are seated and staying in the lifters and rockers and not stressed to any odd angles.Make sure rocker arms clear all stands, valve cover rails, girdles and springs, as slight milling or clearancing may be needed. Once thoroughly cleaned, soak them in engine oil to recoat and lubricate the surfaces prior to installation.An engine can never be “too clean” during assembly.

Cams, lifters and bearings rely on a microscopic film of lubricating oil to keep them from galling, and any debris or grit suspended in the oil becomes an abrasive that quickly destroys their surfaces or gets stuck within the close clearances. endobj This can result in bent pushrods, dropped valves and flattened cam lobes.There is a formula to make sure they won’t bind, if you are technically minded:Basically, subtract the total of how much it’s going to move, the lash and the safety margin from the installed spring height.That difference should not be less than the spring’s published coil bind height. However, most everything also applies to solid cams, especially those high acceleration ones used for limited lift race classes. Cams, cams, cams.. 1 0 obj <> AlexA forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Put the stuff in from Chris. COMP Cams lists the Top Ten Reasons for Camshaft & Lifter Failure. If you dont have poly-locks on the rockers, maybe they came loose. A high-volume oil pump is wise when increasing RPM.An unforgiving nature and high spring pressures make flat tappet camshafts the star of cam failures. This ensures the lifter rotates properly and decreases the potential for failure. The engine needs to start quickly and run at 2,000-2,500 RPM to allow oil to splash on the valve train. 6. This runs on a cam profile, which is tapered across its form.

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