These will out flow even 80% porting heads heads and have longer valve life over non hardened seat heads. Sell them to a restorer and buy some Vortecs that have been redrilled for regular intake and clearanced for valve lift check here ( ) they dont have intake bolt holes redonebut any good machine shop shop be able to do it for reasonable price ,all you do is drill out the old holes tap for pipe plugs and then match to an intake. 470 lift is max for these heads and here I am with clearence with the stock components and if I am reading correctly. Ditch cutting isnt viable on street heads, careful valve jobs can increase flow by about 10 percent on maxed out porting but that kills low speed torque. Now again, I have read for hours about how. Use the neck down stem valves, research double angles on face of valves. 550 lift with big inch sbcĪlso if you run much more than 350-360 ci your really limiting the power potential, on 283-327 they run awesome and if are in good shape can be freshened up reasonable priced. Flow characteristics, on double hump heads are very limited, even with drastic porting they wont flow much past.
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