DesignMan,
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I have done both, and the cylinder mod gives more power. Drilling out the venturi will add a bit of power ,too. But the cylinder mod wins on the power output . It really is not that hard to do, and is Almost the same work as the venturi drilling. One more item, if you drill the venturi too large it can cause flooding and needle set problems.

Tim Wiltse-RCU
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The way you mention geting induction is a way to go, I just don't have much work using the machine tooling stuff. The method I gave is just for those like me with little shop equiptment., and have limited options...

Remby