Editing Camshaft install tips and tricks (section)
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===Engine RPM for break in=== '''13. Failure to run the motor at 2500 rpm or higher (alternating 500/1000 rpm up and down) to allow the crank and rod big ends to throw oil onto the cam, for a minimum of 20 minutes.''' {{Warning}} No idling! The motor should not be run at less than 2500 rpm for a minimum of 20 minutes. If a problem develops, shut the motor down and fix it, then resume break-in. The main sources of camshaft lubrication is oil thrown off of the rods and crankshaft, drain back from the oil rings and oil blowing around inside the crankcase (this is known as "windage"). At idle, the crank isn't spinning fast enough to provide sufficient oil splash to the camshaft/lifters for proper break in protection. '''14. Failure to initially adjust the valves properly.''' Using the "spin the pushrod until it feels tight" method may result in valves too tight. Holding the rocker arm tip down against the valve stem tip with one hand, jiggle the pushrod up and down with your thumb/forefinger of your other hand until all play is removed, then turn the rocker nut the number of times specified by the lifter manufacturer to set the preload. (Another good reason to buy lifters from someone you can talk with about them on the phone instead of buying them in a white cardboard box with no name on it). Builders who have done hundreds of engine builds may have the "feel" to do the "twist" method, but those who are doing their first few builds lack the experience to do this and will have better results with the "jiggle the pushrod up and down" method. '''15. Failure to inspect the distributor drive gear for wear.''' Too much wear can allow the cam to walk in its cam bore and contact an adjacent lifter. The builder is also responsible for using a distributor gear that is compatible with the camshaft gear material. Coordinate this with the cam grinder before you ever begin assembling the motor. Hardly anything will make you feel more stupid than finding one or the other of the gears eaten up, necessitating an engine tear-down to clean out all the shrapnel. '''16. Failure to have everything ready for the motor to fire on the first few turns.''' Fully charged battery, good starter, known-good carburetor with full fuel bowl, source of fuel to the carburetor to allow minimum 20 minutes of uninterrupted running. Ignition timing set. Warning: no grinding on the starter!
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