Hi radar . . .
The only caveat would be the cam profile. Cam profiles include clearance ramps:
The grinder designs these ramps with a specific lash in mind. The first part of the ramp takes up that lash - while the back half of the ramp slowly begins to overcome the inertia of the rocker and the valve and then begins to accelerate both. Lashing to generously uses up more clearance ramp space:
moving the valve event closer to the flank. This can be very hard on components.
Lashing to tightly will extend the total duration slightly by getting the valve off its seat earlier along the length of the clearance ramp (and leaving it off the seat longer on the opposite ramp). But the overall lift is unaffected by lash. Moreover, the added duration will be at very low lifts (as most of a cams lift occurs on the flank).
There are potential downsides to overly tight lashing. Peak heat expansion could take up all the lash - leaving the valve off the seat all the time. This will make the compression stroke inefficient because the intake valve can fail to seal entirely. The same condition on the exhaust valve could cause them to burn because 'seat time' is where heat gets dissipated to the water jacket.
Have you degree wheeled the tighter lash spec you have in mind? How much additional duration are you getting?
regards,
stock49
Performance Trends website discusses lashing . . .
