Hello
I can find plenty of information on this subject for engines with adjustable rockers and/or stud type rockers, but not stock non-adjustable shafted mounted rockers. How is it done?
This is my guess on how it's done:
I assemble the engine up to the cylinder heads
The lifter I check is on base circle - E.O.I.C.
I install a length checker tool - screwed in so it's too short
install the rockers and shaft
screw out length checker until all visible play is gone but, no preload
remove tool and measure with 12-in calipers
Then I add my lifter preload to the that measurement and that will tell me push rod length
From what I can tell, preload is usually in a range and if the camshaft isn't a stock replacement the numbers should be provided by the cam manufacturer.
Ideally all the cylinders should be checked. At the very least the four corners.
So, how wrong am I?
I can find plenty of information on this subject for engines with adjustable rockers and/or stud type rockers, but not stock non-adjustable shafted mounted rockers. How is it done?
This is my guess on how it's done:
I assemble the engine up to the cylinder heads
The lifter I check is on base circle - E.O.I.C.
I install a length checker tool - screwed in so it's too short
install the rockers and shaft
screw out length checker until all visible play is gone but, no preload
remove tool and measure with 12-in calipers
Then I add my lifter preload to the that measurement and that will tell me push rod length
From what I can tell, preload is usually in a range and if the camshaft isn't a stock replacement the numbers should be provided by the cam manufacturer.
Ideally all the cylinders should be checked. At the very least the four corners.
So, how wrong am I?
