Originally Posted by NemeSS

i was under the impression that everybody that was interested in thes heads is becuz they looking for big power on bigger cube engines
i would think that these heads were gonna be used on the lowest cube
as 364 ci
i dont think i would even use these heads on 4 in bore
i am going to a 4.06 bore just for peace of mind
or a 375 ci
or use the 4.06 bore with a 4 in stroke to build 414 ci

streetnstrip:
plz pst p/n for valves and related valvetrain parts
like rocker stands,spring seats,valve seals
for these heads
thanx

Originally Posted by Wnts2Go10O

the reason why they are so big is because the earlier LSx heads have a overly high port velocity. these runners will slow them down enough to get best of both worlds. at least thats what ive noticed

Originally Posted by Jimbo1367

And what would be the DOWN side of high port velosity?

Originally Posted by Greg Fell

if the ports go supersonic, then weird things happen. not that i'm saying they would....