well im soon to get crower 404's and im ordering my customs pistons now, and i need to know bout my valves, i think the stock is 2" for intake, and 1.1" for exhaust, what size should i up grade too... im going all motor..

thanx

 

the stock LS valves are 31mm intake and 28mm exhaust.

you can get either .5mm or 1mm oversized valves. if you want to go all motor just get 1mm oversized intake valves and have the intake ports ported for the oversized valves.

allot of people say that there isnt much to be gained with oversized exhaust valves...but i guess every little bit helps......maybe go for a .5mm oversized exhaust valve.