tourque specs for the cyl head

[custom R]

im putting on a new cool head and im trying to find out how much to tourque the nuts down on the head and what size dome is the best to run premium pump gas any help would be great thanks

[xlr810]

torque it the same as a stock head. 21 ft-lbs.

As for which dome to use... depends on which gasket you put in there, and whether you have stock port timing. On a stock jug using a TRX, ATC or Cometic gasket you could go down to as low as 19-20cc on pump gas.

Cr gasket, 21-22cc.

There are many opinions on this board as to what the static compression cutoff level for needing race gas... Listen to your motor. If you hear pinging in any circumstance then your compression is too high for the fuel you are running.