Richard Good wrote:
> Rocker ratio has everything to do with valve velocity. Lifter velocity
> times rocker ratio equals valve velocity. Boring the block and
> installing .874" Ford lifters instead of .800" stock lifters allows the
> cam to be ground for 13.6% more lifter velocity. Changing from stock
> 1.45:1 ratio to 1.65:1 ratio rockers increases the valve velocity
> 13.8%. Do both and you get a 29% increase in valve velocity.
>
> Richard Good
> Good Parts
>
> William G Rosenbach wrote:
>
>
>> Terry,
>> Interesting stuff. But one question. You state:
>> Because these engines are so restricted by the valve & seat, then
>> the only way to improve them is by having very fast lifting cams and
>> therebye
>> having the vale open for the longest possible duration. The rocker
>> arrangement has little to do with this.
>> Doesn't the increased rocker ratio cause the valve to move faster as well
>> as further?
>> Or is it just a case of to little a change to make a measurable
>> difference.
>> Thanks,
>> Bill
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Richard is correct. The caution is boring out the lifter bore.These are
on a 4.5 degree slant so you can't run straight into the block and
overbore the lifter bores. Ted
--
Ted Schumacher
tedtsimx@bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA 45877
Fax: 419.384.3272 (24 Hrs.)
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