What is it that makes you think any different after reading that? Heads modified or designed for engines turning over 7,000 RPM, race, will typically always have a 50 or 55 seat angle with all of them using a closed chamber and that is directly related as is to. Common to hear that the smaller valve or smaller Port version of something flowing the same as a larger valve will definitely work better..due to Velocity.. that old "smaller valve" talk... and it's true how much air flow can you get versus what you would maximize at lower lifts it's just not feasible ...it would be a saturated head. I might be sharing half thoughts here but just imagine the highest flowing small blockhead and what the industry considers very strong 3 and 400 lift numbers for the 2.02 valve.. let's use
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Now where do they peak flow at?
So many variables and so many ways to build around and utilize things. It starts to come down to the wire when people are trying to build the ultimate Best of Both Worlds type of engines that's when all of these things will make or break it but for the most part if you build it with one purpose one intention not multiple....well..