Due to the larger lift, these Camshafts will also require a larger than stock "shim under" style bucket instead of the stock "shim over" style. See valve train kits: Stage 4 Master Valve Train Kit Part # 1021506 & Stage 5 Master Valve Train Kit Part # 1021510.
The following figures taken @ .050 lift at valve with .000 valve lash.
- Always check valve to piston clearance and Valve to valve clearance with this Camshaft! Failure to install this cam with matched valve train components can cause engine damage.
- After installing a new camshaft, lash #1 intake valve to zero then screw intake valve in .060 (Valves not closing completely) turn engine over carefully with spark plugs removed by hand. Do intakes first, if OK then do exhaust. If engine cycles without binding, you are sure that you have minimum clearance (If binding occurs piston clearance is required). All cam specifications are checked at .050" lift. Standard degree-in procedures should be followed for maximum performance.
Camshaft Break-In Instructions
The first few minutes on a camshaft are the most important wear period. In this period, the cam and followers become burnished together. When installing the camshaft, thoroughly coat the lobes with the special assembly lube provided. Cam must be installed per factory service manual procedures. Set valves at proper lash dimensions, and then readjust valves after break in period is completed. CHECK valve train for interference. CHECK valve to piston clearance, you must have .100" min. CHECK valve spring retainer to valve guide and seal for clearance. CHECK valve springs for coil binding; you must have .090" min. of free travel before the springs become solid after the valve in fully open. 98% of all cam failure is excessive valve spring pressure! Start engine quickly, excessive cranking of engine is not good for the camshaft. Bring rpm to 1500-1800 for 20-30 minutes (ABSOLUTELY NO IDLING & NO REVVING OVER 2000 RPM) during the break in period.
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