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I took a torch to a set and burned all the rubber off. Then I welded some exhaust tubing to the remaining flanges. Then I used rubber hose for the carbs to slide into. That way I could adjust the length of the intake to make bigger carbs fit better. If someone had a dyno and time, they could try adjusting intake length for max power.
It worked for me and the manifolds were junk anyway. Plus I have a ported head and the metal flanges matched right up with the ports.
Ken

AHRMA 412
Vintage racing - old guys on old bikes
 

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Come on Pete, It only sounds sophisticated. I'll put in wanker terms for you. Use a torch(good wanker tool), radiator hose(used from a 71 Pinto wagon) and hose clamps (used not too rusty). There, does that make more sense to you now.
Ken

AHRMA 412
Vintage racing - old guys on old bikes
 
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