[Fot] roller rockers and head flow

[Jack W. Drews]

Terry, thanks for sharing this with us. I found the same thing with 
my flow bench work on both Spitfires and TR6's.

Thanks for telling us about the straight port experiment - you saved 
me all the work of trying this next.

One thing that I found interesting is the flow I measure on both 4 
and 6 bangers with the valve totally removed did not increase as much 
as I expected, and like you, could only conclude that the diameter of 
the seat was pretty limiting. I have found that the 3-angle valve 
seats act as advertised and are the biggest single improvement that 
one can make.

At 11:17 PM 1/1/2008, Terry and Cindy wrote:
>I have yet to trial any roller rockers but it is planned for the in-progress
>rebuild of our race GT6 engine. I can however offer some real-world comments
>on head flow and related matters that might clear up some mis-conceptions in
>this thread....................................
>...............................I'd be happy to swap real results 
>with anyone else who might have the same.
>I'd really like to hear from folk with cam data and anyone else who has
>experimented with larger valves and lifters.
>
>Terry O'Beirne
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