Description
Keith Black piston set is .040 oversize and is for a 3.498 bore. Piston set has a compression of 8.3:1 and includes rings. The Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are .040 oversize for a 3.498 bore and has a 9.5:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power a
11-2257″ Keith Black piston set is standard size and is for a 3.498 bore. Piston set has a compression of 9.6:1 and includes rings. The Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are standard size for a 3.498 bore and has a 9.5:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power an
11-2258″ Keith Black piston set is .005 oversize with a 9.6:1 compression ratio for 1984-up Big Twin Evolution models.
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