Hello,
I just registered to ask a question in this thread. I have a 494 RB block in a custom jetboat, running a Comp hydraulic roller cam, with Hughes (Morel) 5319 lifters, Smith's pushrods, and Comp rocker arms. What preload is everyone running with the Morel lifters? Hughes says to run them at 0.030 to 0.035 with iron block with aluminum heads, so I started out at 1/2 turn (.025) and found them to be very noisy at an idle, even warm. I re-adjusted them to 3/4 turn (.0375) with no change in noise. They seem to be not loosing any pressure when I check under the valve covers, and the engine makes great power up top and the noise does seem to subside somewhat at higher rpms. Is this normal for these lifters? I am running 15w-40 Delo 400 during break in, but will switch to 5w-40 Schaeffers 9000 synthetic after break-in. Any comments will be appreciated.
Mike in Washington state
Mild Cam spec: 224/232 @ .050, 112 lsa, .531 lift.
Heads: Indy 440SEZ.
Oil Pressure at idle: 25-30psi. @3200: 65psi