SMALL BLOCK HEADS

yellow rose said

You’re not listening. I said “port for port”. Take the valve angle out of it, and the SBC PORT is better. The 18 degree valve angle is what makes the weaker SBM port make more power.

You can’t just look at one aspect of any head and claim one is better than the other without looking at valve angle, port angle, cross section, chamber shape, plug location, pushrod pinch etc. It all adds up.

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the biggest advantage as far as flow goes on 18 degree is un shrouding valves. Its also easier to achieve more compression without a dome. that being said un shrouding a chevy head if you could to the max will not let it flow sbm numbers. that is taking in consideration port angle, cross section, chamber shape,plug location pinch etc... what does this have to do with the exhaust anyway your the one not listening when the primary subject is about how well sbm exhaust works