Modifying And Welding a Cast iron head

Rocket said
Good luck with the project. If you go with the angle of the red lines, will you have sufficient cooling for your needs? Are any mods needed to the cooling system?

this head will be a race motor but i might find its way onto the street lol

but no it shouldn't be an issue... the valve seat is still stock and most of the tube will have water around it...

green1 said
Put the head in the oven @400 for 30 minutes, use a high nickel rod. tap any weld you can get to. Back in oven, turn oven off and let it slowly cool.

saved!

what do you mean by "tap" any weld?? would this stress relieve it?? also would you do it after its has cooled?