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OK,I see what you see, remember the 600s only have 1 metering block and a short bowl.My offy is 70s and has removable carb flanges with a dual BP, it is for an RB.maybe they changed it? 
OK cool, I've got the spacers around here somewhere, but they don't have any offset on the center->center. I'll take your word the 600s will fit inline. I've wondered if they would work better with a pair of spacers. Here's a shot of the Offy manifold that ended up in the car- still a work in progress. It made 472 hp, 489 ft/lbs with a small Thumper cam and mildly ported RPM heads on a 9.8:1 .030 over stock stroke 400. That was just getting a basic tune on the dyno.
Last edited by Skeptic; 03/06/14 12:44 AM.
