Quote:
Originally Posted by freethink
My ebay header primaries measure 1.66" or 42mm.
Getting a little off topic here, if you're interested in going further down the rabbits hole, take a look at a technique called Intake Velocity Porting. It involves making your intake ports smaller and more aerodynamic, giving you better volumetric efficiency throughout the whole rpm range. It was developed by a guy named "Motoman" for use on motorcycles, but the same principals apply to any 4 stroke engine.
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Ha! That's a little different to the more common case where someone goes crazy on their ports with a die grinder, eliciting lots of 'oohs' and 'aahs' (and zero before and after power or torque measurements) on the ricer forums
