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Originally Posted by kblake
IMHO:
Gen 3 > Gen 2 under these conditions:
Stock vs. Stock
BPU vs. BPU
As soon as you take the head off the engine, and start doing cams, porting, forged pistons, ems etc. they become equal, or the gen 2 has a slight edge, due to better parts supply chain in North America. Then there is the fact that a ported gen 2 head can ultimately flow more than a ported gen 3 head, with it's smaller ports, which are a compromise between low end and peak power.
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What about the fact that the gen 3 head can support more aggressive cams than the gen 2 due to the latter's larger casting for the buckets. All agressive japanese spec cams are made for the gen 3, not the gen 2.
Or the fact that the gen IIs actually suffer from port jobs? the valve-port ratio is already poor, and the best thing to do is put in LARGER valves. Also shim under bucket > shim OVER bucket.
The gen 2 head is inferior, no matter how you look at it. Let alone the intake manifold, turbo, MAF (vs MAP), etc.