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The "308" head as you described, has a potentially better exhaust flow fully ported. The stock 308 head will not outflow the 915, I guarantee that if I swapped bone stock heads right now, I would see my top end performance decline. As far as the heavier piston, of course it does. it's 40 thousandths bigger, and also taller than the 360. The bottom line is if you took Identically prepared w-2's and I put them on a 10.5 340, and you put in the same with the 360, the 340 is going to outperform the 360. Make more horsepower, rev higher and last longer. The only advantage a 360 has over a 340 is the larger crank diameter, but you can negate that due to it's cast design, except for 71 360's. -70 Swinger 340 #s match, keith black hyper pistons (.030) TA heads 284 cam stock intake with edelbrock carb headers, elec ign 4-speed orig 3.91 sure grip FY1 yellow car, bench seat - best 1/4 time 13.71 @ 102. very reliable, nothing like a 4-speed!
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