quote:Originally posted by Aus Ford:
Press in iron guides could be used on the exhaust.
I would suggest removal of the cracked metal is paramount, a crack in the exhaust port could run anywhere and do who knows what damage eventually.
Aluminum heads use bronze guides on both intake and exhaust. What is the problem with that?
The remainder of the cast iron guide in the ports can be machined out and the bronze guide stands alone as the complete guide.
As long as the crack does not continue into the port itself and create a coolant leak, that's how you fix these heads. The plus side is you get increased air flow around the area that was formally occupied by the cast iron guide support.
Go look at some aluminum heads. See how they changed the ports and how the bronze guide was installed.
Use the teflon "PC" type seals. The guide I showed you "locks" them on so that they won't pop off. That's what that series of fine grooves is for.
http://www.summitracing.com/pa...VH9LSK_qgaAnav8P8HAQ
Engnbldr got back to me and said that he permitted his stock to run out and not replace them.
You are going to have to get the guides from one of the aluminum head manufacturers like TFS or Edelbrock. They are the same guides as far as I know.
I paid $4 per guide. I only have one set of each left for me, so I can't sell you any.