People dont 0-ring a motor to run less then 30psi of boost. Actually the 2 top hp cars at the challenge were both running 0-ringed blocks to get over the 400 whp mark.

 

nowhere did I say the small port was too small. Nowhere did I say it couldn't make big power. Where did I contradict myself? Read it again.

I wasn't putting words in your mouth, I gave an outrageous example that contradicts your statement. Nothing more. Obviously too large of a port and you have other problems.

I'll give you a real-world example, keep in mind a friend of mine was telling about this, but the theory makes complete sense, so I have no trouble beleiving it. On the Pontiac GTPs, supercharged V6s, the boost level is fixed by the size of the pulley. Now, when the guys do a port job on the heads, the boost drops with no change in pulley size.

Does it flow less air? No, it flows the same, just more efficiently. In theory, less boost means less heat, so it could possibly have a higher mass air flow (more power)
Then they go and bump the boost up, throwing the compressor out of it's efficiency range, but that's another story

Boost is created because of restriction, given a large enough volume there would be no pressure (P=VT) No restriction, no boost.

500 RPM quicker spoolup? Please please please explain to me the theory upon which you base this claim on (I have two engineering degrees, so get as technical as you want, the more, the better)

I'll say it again, I have no doubt the small port head can put down big numbers, but if the large port head puts down bigger numbers, then the small port is a restriction, but until you've actually tested it, we really can't say for sure, but the theory is on the side of the large port head.

I'v also got a 2.0, not a 1.8, so let's say the small port is better on the 1.8, doesn't mean it will be better on a 2.0

I have a feeling that small and large port heads have the same cam and valve specs, so the large port head may be hampered by this, and given a larger cam and/or valves, may flow even more (even if the small port had cams/valves)

Out of curiosity, what do you consider red-line?

 

Redline's such a relative thing, anyway.

 

yes it is, that's why I asked