Join Date: Sep 1999
Location: Vancouver, Washingon
Thanked 0 Times in 0 Posts
Re: valve confusion
The most common cause for SBC valve thicking noise is the adjustment for the lifter pre-load. There are several ways to get the lifter pre-load, I doubt my way is any better or worse than any other way of adjusting.
I adjust the rocker arms one cylinder at a time with the engine off, all the spark plugs removed so I can rotate the engine with a socket wrench on the harmonic balancer bolt. When I make lifter adjustments, I make sure each and every cylinder I'm adjusting the rocker arms on is at Top Dead Center of the compression storke. I turn the adjusting nut of the rocker arm until the push rod has no free play to go up or down on the lifter or rocker arm. I then turn the adjusting nut of the rocker arm 3/4 of a turn more. The lifter pre-load for a SBC is .040". By turning the rocker arm adjusting nut 3/4 of a turn, once the zero up/down free play is set, the push rod will be pushed into the lifter .040".