I think its between 60-80 lb. difference in the block, your looking at 1" extra meat on each side. The only extra diffence elsewhere would be in the intake (cast iron) & dist., but if your installing an aluminum intake & billet dist., that shouldn't affect it by much.
Last edited by joedust451; 05/28/1111:57 AM.
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
