Quote:
Originally Posted by SS95003
"48 IDF's have a barrel diamter of 48mm. Which equals 1.89". If you put 2.02 valves under them, your performance will stink. Stick with the smaller ports and valves, and you'll do a lot better. The key here is that you don't have a common plenum, and that makes all the differance." So he was recommending the smaller 165's
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A load of rubbish.
The ideal induction tract has one throat per cylinder with the throttle valve equal to the inlet valve diameter.
The choke (venturi) should equal the smallest diameter just under the valve seat.
85% is considered the correct choke to valve diameter relationship.