Wiseco Piston Kits

[One_Bad_400]

Wiseco Piston Kits .040 do for a 400EX

[F-16Guy]

Going up on displacement will undoubtedly increase power, but you'll find the biggest increase when you bump up the compression--even more power if you add a cam, also.

[One_Bad_400]

thanks but what will it make a 440 or a 416 or something

[One_Bad_400]

what would be the new displacement?

[Wheelie]

.040 is 406cc
.080 is 416cc

Go with 11:1 comp.