Here's the thing with Tunnel rams.
Yes they're cool, they come from the old Pro-Stock cars from the 70's, and made their way onto the street accordingly. For decades they were written off as a waste, but no one understood them, including Hot Rod Magazine back in '82...........
Now, not gonna get into street tuning one of these monsters, a subject unto itself, but what we do with Jet Boats, in particular.
For Jet Boats, these things are absolute TITS! Given the right setup! Most that do it, on BBC or BBF either or, don't realize what's involved and could realistically attain greater results with a single carb situation, in 90% of the cases.
What everyone misses is that these are VERY specific engines. Much like a Blower engine. Forged and/or Billet rotating assemblies, and premium hardware throughout. The difference is to realize the benefit from a tunnel rammed engine, compression needs to be at the extreme high end that fuel will allow, vs much lower compensating for boost on a blower engine. Reason being, more compression equals more "Suction" on the downstroke, intake cycle to take advantage of the plenum volume and velocity incurred past the intake valve. Blower cams tend to work OK with them, but more specific cams are out there to take far more advantage of this phenomena.
Two carbs are almost never better than one. Unless what's underneath it built with that reason in mind.......... JMHO.
Ray
