well I pulled the intake off my temp 360 to keep me running while i rebuild the 401 and i noticed the size of the intake runners where they match up with the heads is substantially larger than the runners on the holley dominator i was running on the 401. can anyone tell me what the diamter from corner to corner on a stock 360 intake is? it doesnt apear to have any machine work done to them but i dont see why the dominator intake would have half the size of intake runnner of a stock intake.
the stock intake measured 2.12 from corner to corner while the holley is probably 1.2 corner to corner

so is it to increase velocity? what is the correlation of velocity to hp/torque how about quantity. etc