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Magnum heads are good. aside from differences in the lifter valley for the roller cams, and the heads themselves, there's not much different.

no experience with a 340, but my 4000 lb Dakota with a 318 magnum with a cam, intake, and exhaust, NV3500, and 3.92 gears on 28" tires, ran the 1/4 mile in 14.7 @ 97 mph the cam specs were 220/230 with a 114 LSA, and it would pull hard through 6,000 rpm.

in a much smaller, lighter car, I bet it would have done low 14s, if not break into the 13s.

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I dont know much about the stock roller cams, is that a small cam? mild? mid-range? What kind ov intake and exhaust? Thats not moving bad for a 2-ton brick...

Sounds to me like a slightly warmed-over (bolt-ons) 318 Magnum would move my 3000-3100lb car pretty good. Basically, if its as fast as my bone stock 3500lb A66 Challenger was with just exhaust, intake and deleting accessories i'll be happy. Because i could have just tuned that A66 car to go MUCH faster knowing what i know now...

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