I'm not a racer, just a street guy, but I do have those Butler mounts on my car. I'm at about 500 hp and as for engine movement, under any condition of load, the shaker doesn't move. When I put this motor in I thought I may need a torque strap or something based on what people were saying but with these mounts it's rock solid. I don't know what kind of an indication that is for anything else.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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