Originally Posted by hcompton
I am actually suprised ppl think tunnel rams are old. Single plane sheet metal was what they started with back in the day for race motors. Then built tunnel rams and got more low end and high rpm tq. Make perfect since its a nice taper into the port and increases the tuned intake length as long as 12 inches or above. It also increase the volume and allow for a larger gump of air. Also solve the 4-7 issue commonly associated with single plane intakes.
A ram will always make more tq than a single plane. And usally the same hp if designed right.
Rams are a huge open plenum area with straight-shot long runners.
You can tune the velocity with plenum walls, and the diameter of the runners. But they still serve a single purpose: high RPM horsepower.
Rams do NOT make more torque.
You always see Tunnel Ram specs making power between 3,000-9,000.
( Usually its more like 4,000 and UP )
Single-plane race intakes are slightly lower at the bottom of their power curve.
Another thing is "swirl". Single-plane intakes swirl better than rams.
Keeps the fuel mixture atomized better.
Rams puddle at low velocity. ( Low velocity = below 3,000 )
If you want more plenum volume... run a 4500 dominator and intake.
DART makes great intakes for BBC.
You can run a 632 BBC with pro heads at 7,000 RPM's with a SINGLE dominator and a single-plane intake.
My favorite intake for street motors is the Edelbrock Performer RPM AirGap.
That intake is the best of both worlds.
Torque, throttle response, and higher RPM flow. It does it all.
Like I keep saying, a tunnel ram on a street motor is for LOOKS.
If you like the look, go for it!