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Old 02-08-2009, 08:33 PM
ratman33 ratman33 is offline
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487x

i have a set of 487x heads on my 355 and they did not have 202/160 valves.they do not have screw in studs.i left the valves,no port work or gasket match and installed 3/8 studs and flat tops and 268xe cam.motor made 297 hp at rear wheel with 3.42 gears.ran a best of 13.45 at 109 in quarter.good heads should get 400hp with bigger cam and some port work.
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