I believe the majority of SS Camaros were equipped with a 350, L48, which produced 295 HP, in 68 and 69 however one could order a big block equipped Camaro, the Camaro SS396, which was available in two horsepower versions, the L34 which produced 350 HP and was the common big block motor and the L78, which was a rare aluminum headed engine, which produced 375 HP and had such things as 4 bolt mains, forged pistons and crank, 11:1 compression ratio, Rectangullar ported heads with ports so huge, you can stick your fist in them!, larger intake and exhaust valves, solid lifter cam and an aluminum intake manifold with a Holley 850 cfm carb.