Thread: cylinder heads and superchargers

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Doing a bit of studying, with a centrifugal type supercharger operating at about 11 lbs. boost in a drag engine, AFR recomends a 205 intake runner, and a cnc'd 73 exhaust port with a 58cc chamber for an engine in the 3500 to 8,000 rpm level.... I'm calculating for street use, 9 lbs of boost a 185 intake with the 73 exhaust, 58 chamber and shifting out at 6500 rpm would be close to correct????? I do know the centrifugal blowers don't like restriction on either the hot or cold side of the combustion chamber.... Just wondering if you engine guys thought I was at least close on a head.... Oh yeah, 408 cubes, EFI, 2500 pound car with a 5 speed.... AFR calls the head an Outlaw Street head, part #1406----but doesn't have anything on the exhaust port rework for the supercharger..... Also looked at a similar Trick Flow head, close to the same specs including the 8mm valves and .600 lift springs, etc.



OK, so AFR explains it waaaaaay better then I do:

Quote from AFR data--

Outlaw heads for the street or strip from AFR!
These AFR SBF Street/Strip Outlaw aluminum cylinder heads come ready for maximum small block Ford performance. They are not emissions legal. The 165cc heads come with lightweight 8mm, 1.900 in. intake and 1.600 in. exhaust valves and the 185cc version sports 8mm, 2.020 in. intake and 1.600 in. exhaust valves. Both cylinder heads feature 58cc or 68cc combustion chambers with 68cc exhaust ports. Both the 165cc and 185cc heads have an available nitrous or blower exhaust port option featuring a 70cc ultra high-flowing exhaust port. With AFR's trademark 3/4 in. thick head deck, it's no problem handling that additional cylinder pressure. Each of these serious race pieces in street disguises is also drilled for the larger 1/2 in. head bolt hole as a standard feature for maximum head gasket retention.