Read this carefully!
The bolts holding the head on the engine must be evenly tightened and
the head must be properly seated.
Hold the head down on the engine and thread each the bolt
in until it starts to tighten. Back the bolt out one full turn.
Repeat with each bolt.
Using the number order shown in the image, tighten each bolt in
approximately 1/4 turn. Do the same to the next bolt. Repeat
this until the bolts start to feel snug. Continue tightening using 1/8
turns. Finally snug the bolts.
The pattern is a criss-cross to
ensure the head is flat on the liner and sealed properly.
Do not excessively tighten the bolts or you will strip the threads in
the aluminum case.