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I think you left some on the table, bump the timing up a little to 35 deg and try it again, you might get a little more out of it.



These magnum heads don't really need all that timing like the LAs, the most i'll go is 32* & see how it does but thats it, i don't want detination, i'm running on 87 octane.

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