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D port head? Is it worth it on a 1000g
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Doug
My opinion is...... you may notice an easier performance improvement by replacing the stock exhaust system with headers - if they're still available and not priced off the moon. It's also my opinion that the advantage with headers is not that they make significant power improvements, it's that they weigh less which is a performance improvement.
If changing the head has shown power gains and it's not a budget buster, you might also have .010" or .020 taken off the head and at least lap in the valves prior to installing. You may also need adjustable cam sprockets or you can slot your existing ones. That way you can play with cam timing a little should the urge strike. I'm guessing there is sufficient adjustment within the cam chain adjuster that no work needs to be directed there.
OK, I admit I don't know the differences between the two head designs you are referencing to. There is an old old book on the design of intake and exhaust systems that I read years ago. I gave the book to a pal who builds supercharger conversions for Lycoming aircraft engines. He's done a lot of work putting different shapes of exhaust flange inserts between aircraft cylinder heads and the exhaust pipes. He has a dyno for a/c engines. These engines are 360 C.I to 540 C.I, but gas is gas.
Amazon has books on the subject: https://www.amazon.com/s/ref=nb_sb_s...gn%2Caps%2C261
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