Quote:
Originally Posted by Pripyat
I saw that head but I was worried it had a large combustion volume (for 63mm) and i'd end up better off with slightly smaller valves with a combustion chamber designed for 58 or 61mm.
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I found the larger cc heads work fine as long as you supply enough air in and out. A large uni, a 1-3/4" id x 6.5" long velocity tube, 30mm carb and 7/8" id exhaust works great. I always focused on packing as much air and fuel as physically possible into the head and enough pipe to move the a/f out. I think it like a air pump, the intake, chamber and exhaust matched to move large volumes of air efficiently. There's tons of variables here but that's a basic concept.