20v vs. MC head flowing

[Michael Gough]

Jay Rabe Wrote:
>The 20v has smaller rod journals (weaker) than an MC.  I am almost positive the
10v and >20v rods are the same length.  4 valve heads flow ~140cfm vs 2valve
@ ~120cfm.  So a >decent port job on an mc would outflow a stock 4v head.
but of course a ported 20v >would be much better. Manifolds make all the
difference power & torque wise.

Anybody else have any flow bench data to confirm this? A 16% increase in
flow for the 20v doesn't seem to justify the cost or added complexity for
me, not at this stage of the game anyway. The MC heads are cheap enough I
can try my hand at porting myself, and comparing flow to the stock MC flow.
Even if it took 10 heads to get it right, which would allow 50 different
porting techniques, it would be cheaper than the 20v. For some reason I
thought the stock 20v flowed a LOT better than the stock 10v. It seems this
might not be the case.
Thanks everyone
Mike
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