Ok, so my engine (454 BBC) has a comp 302 extreme marine Hyd. roller. I have run this all last summer just fine.
At the end of last season after a hard pass the engine had an immediate "miss" at idle and just off idle.
I pulled the valve covers and could find nothing out of place. Simple compression check showed little to no variance.
Tore engine down this winter, checked everything and re-assembled basically.
Engine was dynoed and nothing out of the ordinary was reported. (I was not there)
Installed engine and fired. Distinct popping out of right side header. Not random, but steady pop as if a lobe were gone.
It did seem to clean up if the RPM was held steady at 3000 or more.
Pulled VC and ran valves. The #8 ex. rocker was adjusted properly BUT had zero resistance against the lifter plunger. (You could depress the plunger with one finger as if no oil at all was in it)
I cranked the engine with remote starter and had steady oil on all the other 15 rockers but no oil on #8 ex.
No other rockers were able to be depressed against the lifters and had solid zero lash.
If this lifter is not pumping up to zero, will that cause the steady popping sound?
You can hear it very distinctly just cranking the engine over without starting.
I have read about internal lifter failures with Comp hyd rollers, anybody have any advice?