[Fot] Roller Rockers

[Allen Washatko]

FoT,

I need some input regarding the use of roller rockers on a race 
prepared TR6. If you are running a cam with .500 lift and 300 degrees 
duration, does the use of a higher ration roller rocker (1.65) really 
add that much more power? This is assuming that the head is well ported 
and you are running the largest intake/exhaust valves that fit in the 
head. I was just made aware of some engine testing recently that 
indicated that there was only a 2 h.p. gain by using roller rockers 
with the above modifications. It also indicated that the increased 
ratio caused more wear on the cam, tappets, etc. The logic as presented 
seems to be  that you can only draw so much flow through the head 
before you get diminishing returns. Any thoughts on this?

Allen


Allen & Jody Washatko
1971 TR6  - Number 6