Yea stay cathedral. The square port heads are really designed to work with a slightly larger bore due to the intake valve size. It will fit in a 6.0, but the valve tends to get shrouded and it hurts intake air flow. The 243's will be better for low end TQ as well which that tahoe needs big time...

 

Im about 90% sure Im staying cathedral now. Just may mill the 317 .010-.015 and run them with .040 head gaskets. Im focusing all the extra cash that Ill be saving to put towards the TBSS intake and 102 TBC throttle body.

Now that Setup ^^^ (cathedral) VS a L92 heads setup with l92 intake, with said cam.

You guys think It may make better power, and more suited for a street Tahoe?