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Actually adding the shim to a stock non piped mach z lowered the rpm at which peak power ocurred.I have a dyno sheet from Polar Motorsports that shows hp and torque up signifigantly and peaking between 7800 and 7900rpm.As far as being a good mod I would say its a better bang for the buck then pipes.While you have your jugs off and your head is either replaced or milled to allow  the chamber to hang down into the clyinder, carefully deburr all casting flash, and port match your upper half to the jugs.(there is alot of over lapping metal sticking into the transfers)We have done several of these kits at our shop and the only problem we have is finding enough weight to keep the motor under 8000 . You will be very pleased and only sharp eyes will pick out the thicker base gasket.   good luck
 

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Im not too sure about setting up a long track as compared to a short track, my own personal mach is a 98 with above mods plus a little exhaust port clean up and v force reeds.A couple of weeks ago at a 1000 foot radar run it ran 112 mph and we could only hold it below 8000 rpm for about 800 feet. Weve put in so much helix that it wont hardly back shift and it still over revs. Ive ordered a set of thunder shift arms and am looking forward to trying these and posibilly an rer secondary. As far as jetting goes,for z we usually run 45 pilots, with stock jetting and tempaflow(which work awsome) I would think that 110 in 2000 feet would be pretty good for a long track but the mods you are thinking of should add at least 5 mph to your top end if not more.
 
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