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You won't get the HP numbers you're looking for without port/polish and bigger valves on the heads. I'm not talking radical, just cleaning up the casting flash and smoothing the runners. With factory heads/valves, you might get 1 HP/cu in, maybe a little over 300.
Bob
tufcj
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You definately dont need to polish. Port work can help but compression and a good cam would be a good start.
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alright well il have to see what he wants to do after he's looked at it and try to convince him into using the bigger valves
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The power numbers you are looking for (400hp) will be difficult w/ the little 304 (difficult is just another way of saying EXPENSIVE). I think you might be happier with a nice 'normal' performance build and then add a shot of N2O for those rare times when you really need the power. This will most likely be the most cost effective way to hit 400 hp and you'll have a reliable / drivable engine for the 99% of the time you don't need 400 hp.
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i agree with that statement but i would also be fine with only 300 horsepower with hopes of getting that and maybe 400 torque so far i only have a estimated price for labor coming in at a little over a grand