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Gearheads
489" chevelle Gotta love a tunnel-ram BBC
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<blockquote data-quote="swampratt" data-source="post: 3076779" data-attributes="member: 15054"><p>That is odd.</p><p>I have ported many sbc heads and the 2.02 valve in non ported head is not worth the bother.. you will actually be down on power.</p><p>Valve is too shrouded.</p><p>My old 186 casting double humps with 1.94-1.50 would out flow the RPM heads and the runner was not enlarged much still came in at 158CC</p><p>My 305 HO heads with 1.84-1.50 valves come in at 170cc runners and flow very well for what they are.</p><p>Flow aside shape is very important especially the chamber. Lot of power in the chamber especially if you rev it past the 6000 rpm mark. Or if you stuck large valves in it.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3076779, member: 15054"] That is odd. I have ported many sbc heads and the 2.02 valve in non ported head is not worth the bother.. you will actually be down on power. Valve is too shrouded. My old 186 casting double humps with 1.94-1.50 would out flow the RPM heads and the runner was not enlarged much still came in at 158CC My 305 HO heads with 1.84-1.50 valves come in at 170cc runners and flow very well for what they are. Flow aside shape is very important especially the chamber. Lot of power in the chamber especially if you rev it past the 6000 rpm mark. Or if you stuck large valves in it. [/QUOTE]
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