Street Ryderz
Well-Known Member
I think these large surface area heads are great and for the price well worth it BUT make your choice wisely!I think for most users the torodial head fits the need of helping to produce low and even mid range torque and run nice and cool even with mods like comp boost,port volumes and timmings and is the most commen chamber shape used by the after market vendors!The hemispherical chamber is better suited to higher output high rpm set ups!Steve Best and other's have said this before on here and led me to try to get the best of both!I took the round head with the torodial chamber and cut the inner radius towards the squish band reducing it's width to 4mm and shaved 1mm off the mating surface.Doing so yeilded just over a 1000 rpm gain but also lost some bottom end torque and also made the pipe hit softer with a slight effect on jetting!I dont want to mess up the chamber more than I have allready LOL as it still works pretty good! So I ordered the thicker finned round head with a hemispherical chamber that looks like I can deck and add a squish band to and hope that by reducing the chambers volume and keeping the comp up where it is now that it will have some torque in the bottom!
