As a side note, some of you may remember that I'm trying to run a Martin
engine, which has a three valve pushrod cross-flow aluminium head on a 120E
ford block. I ran into some servious valve train problems last year, which
prompted me to buy a well developed pre-crossflow head from a lister. That
head has since been installed on a friends 1500cc engine, and is making
excellent power. Point is that the volume of the ports on that head must
be one third the volume of the ports on my Martin heads! Interesting...
Brian
At 11:27 PM 05/25/2000 -0400, Jim Hayes wrote:
>Flow is another matter. A bigger intake may not flow as well as a
>smaller one, due to the velocity of the mixture being lower. In the Alfa
>GTAs, Don Black was able to get higher HP by actually sleeving the
>intakes to get a smaller diameter. When we had Mike Sperry port my head
>a few years ago, we started with an earlier Alfa head with smaller ports
>to get the best flow, confirmed on a flow bench.
>
>
>
>
>--
>Jim Hayes Fotec/Cable U
>hayes@mediaone.net http://www.CableU.net
>jeh@fotec.com http://www.fotec.com/
>All generalizations, with the possible exception of this one, are false!
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