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since the stock vavletrain is non adjustable...if i put a bigger cam in a magnum smallblock, will it need alonger pushrod??



Shouldn't. You can always gets adj. rockers fairly cheap, are you planning on changing springs? You really should to match the cam so you don't float the valves,just be awhare the factory bolts are small & could break if spring pressure gets too high. Are these factory magnum heads?

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU