If anybody has tried this, I was wondering how long are the intake runners on the manifold? This is just from the manifold face to the end of the runner tube, not the total length from the airhorn to the valve. I dont want to seem like I'm trying to pump somebody for information, maybe just a opinion about long runner/short airhorn vs. short runner/long airhorn set-ups. Also , was it worth it after the work and tuning from a performance viewpoint?

 

if you are refering to the ram effect then i beleive the math part would be as followed:
84000/rpm= length of manifold to the face of the valve. depending on the build it may provide up to 30% more air into the combustion chamber. they used this on two older chrysler engines with great reslults that dominated the streets in the 50's i beleive. i would take that with a grain of salt as a good tuning starting point and try altering the setup on the dyno. now is it worth it? i beleive so. this is also why itb's or side drafts kick ***!