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Hi Neil,
All true, but for the x-section, of which I'am not sure. They look about the same to me and is difficult to measure for a difference.
Don't deduct from the fact that square ports are used more by well known tuners that they flow more! After all it could just be a matter of availibility! Remmele's supplier AMC only makes the squareports, so he cannot use another head for extreme porting, because max porting is only (well, preferably) done by high end tuners with new heads and there are no more new oval ports heads availible anywhere anymore.
The reason that AMC only makes the squareports could also just be the fact that they originally were meant to repair T25 (Type3)buses.
In reality, I think the early part of the ports are virtually the same for both type of heads and only the last part is different. Therefore stock flow will probably not differ much either.
Greetings,
Walter
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