Heas for Xmas

[Scoobum]

great info,thanks. Can fully ported stock irons reach the same flow #s that champ.ported irons do?   As far as losing some low end power...i felt that with the faster billet wheel spool up i've seen and the added torque from e85 as well as alittle more stall, things would work well together.

Norbs and I both have the same set of heads ported by a gentleman we know...and here's the numbers. Norbs went 10.3 at 134 on 34 PSI...and I went 11.5 at 121 on 20 PSI. As Steve says...nothing magical about Champion heads.

[Charlief1]

The only advantage to champions is their consistancy. A really good porter can get more out of a set of heads than a CNC machine can ever do.

[grand camino]

  thanks...this what i needed to know.I had thought that maybe being that the GN1 alumnums where a completely different casting that they started out about as big as a set of well ported irons would be.  But also that the bowl area, on GN1 alum, may be shrouded and unless you had a bigger inch bore they are not fruitful?