just installed and tested the 1-1/2" long aluminum carb intakes i made the other week for VM's. 3HP is probably conservative, according to seat of the pants dyno and newly slipping clutch. clutch used to occasionally let go in 4th under hard accel, but now 2nd through 5th and it's almost impossible to get to WOT.
so that's the good news. bad news is i have to swap out the old 6/5 plates for 7/6, preferably kevlar with heavier springs. granted it was just 50* today which carbs love (cold dense air), but the extra zip was unmistakable, and smoother delivery too.
the intakes are not tapered but are port matched, and are installed with 3Bond no gaskets. no jetting changes required.
i was pretty surprised, having only used rubber intakes before. if you're running performance carbs pick up a set of real intakes somewhere, you won't be sorry.
so that's the good news. bad news is i have to swap out the old 6/5 plates for 7/6, preferably kevlar with heavier springs. granted it was just 50* today which carbs love (cold dense air), but the extra zip was unmistakable, and smoother delivery too.
the intakes are not tapered but are port matched, and are installed with 3Bond no gaskets. no jetting changes required.
i was pretty surprised, having only used rubber intakes before. if you're running performance carbs pick up a set of real intakes somewhere, you won't be sorry.