quote:
Originally posted by LTP:
What about the hump on the roof of the exhaust port? In a Mustang with headers does this help direct flow downward or should it be eliminated regardless of application?
The flat roof in the exhaust valve pocket and the bump in the exhaust port roof were placed there to encourage exhaust gases to flow downward into the exhaust manifolds. They should be beneficial for any exhaust system that turns abruptly downward to hug the side of the engine.
quote:
Originally posted by LTP:
Should the material around the intake valve guide be teardrop shaped to help direct flow away from the cylinder wall,
No. It would be better to remove the valve guide casting all together.
quote:
Originally posted by LTP:
Should the material around the intake valve guide be ... eliminated completely or left alone.
The trend today is to eliminate it completely ... as in the picture I posted.
quote:
Originally posted by LTP:
Seems to me leaving some cast iron around the valve guide helps dissipate heat from the intake vale.
The intake valve runs "relatively" cool, it is cooled by the incoming fuel and air charge.