Here is something I remembered I have sitting around so tell me all what you think for the 400 cyl head swap. I will only be testing one set of heads so tell me which you think will be better and why? 1st. up 906 Vorted heads LT4 valve springs and a 3 angle valve job, no porting 2nd. up Phase 1 034 Bowtie heads, screw in studs, more valve springs, they are ported and ran 11.59 on my 358 with the Elgin 1165P hyd Cam. 3rd. Phase V Bowtie heads all ported, fresh valve work and all the same stuff as the Phase 1's I want to do this head test on the 400 using the same RPM Performer intake and 268H cam. Let's hear it guys and if you don't like these heads I always have some AFR's, LOL.