little 'ol 273

hi, the stock 920 head will out flow the 302. also, 920 has a closed chamber.
the 273 head responds well to sst nail head valves. also, 920 head has more port velocity, which is needed to fill cylinders faster. you can do some mild bowl blending ,remove all sharp edges, this helps flow greatly!! if so desired, cut down 360 valves to 1.84 and 1.56 diameters. the 920 head responds very good to this size. the360 std size valve doesn't as good have good port velc.
Isky makes avery nice solid lifter cam, grind is the E 4, 260/218 dur, .425 lift, on tight lobe centers, 108 lca. it does work very well in a273!!!