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Definitive answer...B20 Valves 140-160

posted by  jparker3 on  Fri Feb 2 16:56 CST 2007
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last visit: Tue Jun 9 18:47 CST 2009
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A compromise yes, but not for the reason you mention.
For a larger valve to work, the port throat and bowl below it have to be
larger in proportion. I've never had a crack between the valves on the head,
but I have had the port bowl get too thin when porting for optimum flow with the larger valves. So, yes there is a compromise on most of the street heads for reliability vs the small extra gain of going to a 38 mm ext valve.

John
V-performance.com






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New Definitive answer...B20 Valves [140-160]
posted by  volvo245gti  on Sun Jan 28 05:12 CST 2007 >


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