U12 2NR wrote:If I were you, I would leave the runners the way they are. The more material that is on the head flange means that more heat can safely be dispersed throughout. If you seperate the runners, there's less materal to absorb heat, so each runner will get signifigantly more hot, which greatly increases the chances of warping.
Well, most people that I have seen don't take too much material, just cut it between the runners so it doesn't crack as easily upon expansion. Even so, there is really no point for the manifold to absorb heat. It is MUCH more beneficial to cut between the runners than to not, assuming there was a benefit to not cutting it.
And good idea with enlarging your bolt holes, someone has been reading their corky bell.
