Brodix-11 heads vs 11x heads

[sausageguy]

Is there really a difference between the two? Brodix website says that special pistons are requiredfor the 11x , but nothing like that is said for the -11s. Thanks .

[perfconn]

Yes there is a difference.The 11X heads are way better.

[let-r-eat]

Think about those two heads in this manner:-11 = day 11X= night

[sausageguy]

But Both are still 23 degree heads right?

[perfconn]

Yes but the valve spacing on the 11X heads are wider.

[sausageguy]

Thank You!

[DaveBauerSS6]

Yes there is a difference.The 11X heads are way better.

Is there a difference in the power due to the valve spread spacing on a 4 inch bore vs the 4.125. Shrouding the x to a 4 inch too much?

[perfconn]

4.125 bore will make more power than a 4 inch because of unshrouding the valves.