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wow is right!!! those cylinder heads outflow AFR's 205 cc cylinder head by 48 cfm at .600 inch lift on the intake side. but this is because these heads have way bigger intake valves than AFR heads have. unfortunately the exhaust side needs major work relative to the intake side. now i know why the general put a big dual pattern duration on the exhaust side of the roller cam. this also explains why LG's headers are gaining so much power on this engine too. me thinks the ideal cam for this head to make more power and still pass emissions would be the following:
intake exhaust
lift .610 .615
duration@.050 220 240
LSA = 114
since the exhaust to intake ratio on the flow of the cylinder heads is a horrible .63% at .600-.625 lift, a cam of this sort would make about 20 more rwhp and should be good for a 100 shot of nitrous. since the engine has cast pistons i wouldn't spray more than a 100 shot though. also since the exhaust side of the cylinder head has such poor flow i would definately put LG headers on to help alleviate any potential for exhaust gas reversion back into the cylinder when using the juice. beyond this level you are gonna need to full port the exhaust side and install bigger exhaust valves to get bigger gains. and if you do that you are gonna need a header with at least a 1-7/8 primary.
fyi - these lift figures are based on the 1.8 ratio roller rockers that come stock with this engine. bottom line here is > there is no way people are gonna pickup anymore than 20 rwhp off a cam swap on this engine and pass emissions unless they do a full port on the exhaust side of these cylinder heads and put in bigger valves.
Last edited by Fast Freddy : 11-01-2005 at 12:20 AM.
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