I find it can tough to compete price-wise with the CNC jobs, especially for applications where the heads to be ported are getting "extensively" modified.
None of the ones I ported ever put up "the big number" on the flow bench, but they all seemed to go pretty well in the cars they were used in.
IMO, the biggest restriction to flow with the non-Chapman stage 6's is the lack of intake port height under the valve spring.
With all the head options out there today, I think by the time you fix all the typical stage 6-isms, and buy all the parts, and have them fully ported...... I can see where you'd have more into them than some other "better" options....... And that's even if the castings themselves were free.
Prime observations and advice. You have to beat Stage VI heads into submission. There are much better options out there........unless......you can do all the work on these heads yourself. And then, there are still better options than these dinosaurs.
