I think the Edelbrock LD4B and the Weiand Stealth are the same thing...
What cubic inch was this motor?
360 +.40" or +.060", I forgot which I had at the time. 10.5-1, unported 1.88" OEM heads & tuned 750 double pump carb. Hydraulic cam is almost .474" lift but has a LOT of duration. The single plane intake worked better because the converter flashes to 5100+ at launch and the rpms never go under 47-4800, even on a "bad-air" day.
The best theory I can describe it with is that even though the advertised "power range" of the Stealth is idle - 6800, the engine operates only in the top 1/3 or so. The Holley starts at 35 or 4500 and goes to 75-8000. (I don't have a older catalog that still lists it.) So my engine's
whole operating range is right in the middle of it. (Area under the curve.)
* Also keep in mind that the difference wasn't more than .10 and 1-1.5 mph! (All weather factors considered.) With a little more carb tuning on the Stealth (because of the different intake designs), the difference could have been a little less. But in class racing with all the restrictions, we look for small improvements. So I came to the conclusion that the Holley intake was a
little better for
"my" particular combo.
So for most people running any less gear, converter, cam duration, etc., my 2 cents is that a good dual plane, like the Stealth, LD340, LD4B, RPM, etc. would be as good or a little better than a single plane intake. But it can still take a lot of carb tuning to optimize the carb for the combo. I'm always tinkering with mine.
There are a lot of regular Stock class cars with OEM cast iron intakes and Thermoquads that are a lot faster than mine! But they tend to have more time and resources. The Demon that Physixx has is one example.
