I'm working on tracking down a persistant miss and have checked/rebuilt all possible ignition settings/parts. Still have the miss - althought I have noticed that #4 hole is fouling its spark plug. Now to check the valve train.
I've read a few posts on taking cam lift measurements and compression testing, and have a couple questions:
When measuring cam lift with a dial indicator (have the indicator and magnetic base ready to go), is the measurement calculated directly from the rocker surface above the valve stem? Should the measurement match the cam lift specs exactly?
Secondly, what is the reason for removing all of the plugs for a compression test? I was too late in learning about this step in the procedure and did the test by removing one plug at a time - and taking the reading on a cold engine (all holes read 170lbs within a few lbs. +-)
I've read a few posts on taking cam lift measurements and compression testing, and have a couple questions:
When measuring cam lift with a dial indicator (have the indicator and magnetic base ready to go), is the measurement calculated directly from the rocker surface above the valve stem? Should the measurement match the cam lift specs exactly?
Secondly, what is the reason for removing all of the plugs for a compression test? I was too late in learning about this step in the procedure and did the test by removing one plug at a time - and taking the reading on a cold engine (all holes read 170lbs within a few lbs. +-)
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