Replaced both exhaust adjusters with RGM parts in Mar 09 and one has really chewed up a valve in 4000 miles. But, to be fair that valve was starting to show significant wear. These were not AN items so I replaced with one of theirs and a new ex valve. The AN profile is a little different from RGM. The AN item better be good with the UK price at £6.50 now...$10!! The exh valve tips have a hard time with the angle they operate at, compared to inlets.The adjuster screws were also badly pitted...New AN valve adjusters didn't look much better but I won't go off again on my AN parts quality rant!
Replaces the base gasket (if you use one) which is around 0.015". My plate is 0.030". So, it lifts the barrels and head which is compensated for by backing off the valve adjusters and therefore I don't see how it affects valvetrain geometry much. Yes, the rocker and adjuster contact angle will change but by how much? Is it enough to justify shortening pushrods which is the recommendation with high lift cams and substantially shaved heads and is what I did when I found std length rods in my engine with a Combat cam and head. Since then I went back to a std cam and have just installed a PW3. Will have to see how wear develops this year.What is a "compression plate?" How does it change valve geometry?
Keith1069 said:Replaced both exhaust adjusters with RGM parts in Mar 09 and one has really chewed up a valve in 4000 miles. But, to be fair that valve was starting to show significant wear. These were not AN items so I replaced with one of theirs and a new ex valve. The AN profile is a little different from RGM. The AN item better be good with the UK price at £6.50 now...$10!! The exh valve tips have a hard time with the angle they operate at, compared to inlets.The adjuster screws were also badly pitted...New AN valve adjusters didn't look much better but I won't go off again on my AN parts quality rant!
splatt said:Something to ponder on your old antique motor, at 6000rpm the top of each valve is being hit 50 times a second, its a wonder they last at all :!: