I fully know what a knurled guides ID looks like and have done the process many times myself on heads ( mainly cheap owners who have Chevys ) that people want a cheap repair on, and the process does make a pathway for more oil to leak down the guides it's done on.
In my opinion it has no place being done on a motor that will re-use original valves, nor any motor that will be anything but a grocery getter for the owner, and never be called upon to spin more then 3500 rpm.
Also note that when I knurled guide is fully worn again those guides are now way looser before they where knurled!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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