those springs are in the same general range that the heads call for...
comp cams= 1.464" height, 331lbs/inch
Ford gt40 valve train assembly with dual springs #m-6513-a351= 1.460" height, 394lbs/inch
what does your cam call for? what is the lift? it should tell you what are acceptable spring rates, heights, pressures. also you will have to use adjustable roller rockers with either.
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