O-ringed Head
It's actually a combination. If you go with a larger diameter wire, you usually want less protrusion. The wire has to make a "crimp" in the fire ring of the head gasket. If the wire is larger then it is harder to make it sink into the fire ring. If you have to much protrusion then you make get a really good seal on the fire ring, but the head may not have enough clamping force on the rest of the gasket. This causes coolant and oil leaks. Typically the more the protrusion, the more retorques you will have to do, but the end result is a better sealing head as long as you don't go overboard. To small of a o-ring wire and you do take the chance of actually cutting the fire ring.
I hope this helps...
Paul
I hope this helps...
Paul
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ok thanks guys,all i know that i want is 400hp with a ve pump.im lookin for the motor to be able to go to hell and back a few times and then back to work.the turbo i got planned is a s300 custom 62/65/13 combo what else do i need to make the bottom end as bullet proof as the head?
ok thanks guys,all i know that i want is 400hp with a ve pump.im lookin for the motor to be able to go to hell and back a few times and then back to work.the turbo i got planned is a s300 custom 62/65/13 combo what else do i need to make the bottom end as bullet proof as the head?

Going to 400hp, you should never have to worry about the bottom...
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