I will using the 1.65 ratio. I suppose that your
friend got the 1.5 to keep the idle and other
chatracteristics. I want more lift and duration
though. THe 1.65 would be the sure way to go for my
needs right?
Mark
--- FODFARTS@cs.com wrote:
> Hey Mark,
> I don't have first hand knowledge of APT's
> roller rockers, but a friend
> of mine swears by them. Besides my 64 Spit, I bought
> a Mini last year and
> thus have been thrust into the A-series engine
> world. A book by David Vizard
> is extremely enlightening on the subject. In Mini
> and other A-series engine
> powered circles he is known as Vizard the Wizard. He
> was one of the fellows
> to start APT and is truly an expert. To get to the
> point, a friend of mine
> builds engines for Midgets, all A-series, and says
> that the 1.5 to 1 ratio
> roller rockers are the best single "bolt-on"
> improvement one can make. He
> calls them almost bomb proof and likens there
> installation to installing a
> hotter cam. You get more lift and thus better
> airflow without getting into a
> lumpy idle or rough low rpm drivability. He also
> likes them because the
> roller tip greatly reduces the side load imposed on
> the valve stems,
> increasing valve guide life. Not sure what engine
> you have, but it should
> have a similar effect. I am waiting until the new
> year to look into a set for
> the Mini, The Spit needs a little work first and
> thus is first in line for
> budget considerations. If you do get them, let me
> know how they work out, I
> always like getting more than one opinion on
> performance mods. Hope this
> helps.
>
> Brad
>
=====
-Mark Holbrook-
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