Note: this is posted for a friend who could not post to net. Not my opinion...
don't flame me (this time, anyway). HP
>Harold...
I would appreciate it if you could repost to the vintage-race list since I do
not have access from this address...
Roller rockers are not a performance advantage for A series motors. What
roller rockers do is give you longer valve guide life, due to less side thrust
on the valves. Roller rockers are noticeably heavier than non-rollers, so if
you want to run high revs, non-rollers are probably superior. Many of the
fast guys in SCCA run non-rollers (Comptune sells his own version of
non-rollers) due to less valve train mass. Additionally, non-rollers cause
some mushrooming to the top fo the valve and the rocker tips wear much quicker
than rollers causing the need for rocker replacement. I have run both, and I
find it is cheaper in the long run to run rollers due to less valve guide,
valve and rocker wear.
Jim Fuerstenberg
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