donfordguy

my question is whats the biggest valves you can put in the iron gt40 head does anybody no

mjr46

they come with 1.84/1.54'swith seat work you can have 1.94/1.60's put in but to do much more it'll cost a bit more and honestly when you get done paying for all the new valves and machine work...I'd of rather thrown that money towards a set of decent aluminum heads