It’s a comp hydraulic cam... my builder said it will be fine but we will need to figure out the lash.
That’s a bit of a head scratcher for me. Hydraulic grinds tend to be pretty aggressive in clearance-ramp area because the hydraulic action of the lifter acts as a shock absorber. Not sure if this is adding to the chatter when the lash is taken up.
I am running solid lifters on my stovebolt. The cam-card calls for .008 clearance on the intake and .013 on the exhaust. When I first put the engine together I lashed generously at .010 and .015 so that I could sort out the rest of tuning before addressing the racket.
Once I had the engine running and idling smoothly I began to take out lash in order to reduce the chatter. Once the engine was hot I dialed the lash back to cam card specifications. It was still quite the chatter box. Over time I have tightened the intake lash to .006 and the exhaust lash to .011. It is considerably quieter at idle. The lash spec is there to prevent heat soaking (and resulting metal expansion) from holding valves open when they should be on their seats
