colin1928
Well-known member
Hey Tod,
Please take a look at the aluminum Winfield that I posted above and another look at the iron Winfield . Particular attention to the really wide gasket support areas of the alum head....BETWEEN cyls 1/2 , 3/4. Now look at the really narrow gasket support same areas of the iron head. VERY VERY important consideration ...is wide/sufficient gasket support in these TWO areas , particularly the higher comp ratio gets.
Rick you are looking at this the wrong way the reason for the narrow area on the original head was to improve gas flow you need space between the valve and head wall for good flow
try reading
Phil Irving book tuning for speed
Harry Ricardo books
Triumph Harley Davidson and Briggs and Stratton all found reducing valve shielding helped with power
Colin