what compresin ratio

[Grant Casey]

im thinking of get a 440 kit cam and all that stuff.
Wat compresin piston is the best. and wat do u run

cheers

[krt400ex]

11:1 is prolly the best unless ur looking to run race fuel. then u could go as high as u want


make sure u get heavey duty studs

[smitht316]

i would go 11:1 and no higher. those engines are just not built to be that fast. if you want faster then buying a new quad is the way to go.. i built my 400 up and now wish i would have just sold it and bought the 450r. i have had no problems with my 426 11:1 yet but i still get worried everytime i go out about blowing a head gasket

[400eXr1d3rZ]

Originally posted by krt400ex
11:1 is prolly the best unless ur looking to run race fuel. then u could go as high as u want


make sure u get heavey duty studs

You don't need HD studs.

[krt400ex]

Originally posted by 400eXr1d3rZ
You don't need HD studs.


with the 440s u do. they blow head gaskets all the time