Ported Intake Manifold – Stage 1
In the box of goodies that I got with the Corolla there was a stock 3TC intake manifold and carb. “Free” (well, prepaid….) so I decided to see what I could do with it. The dirt track scene sees LOTS of these engines in mini stocks and they can be made to work quite well with a Holley 2300 base carb (350 or 500 CFM) or Sniper efi set up. However, the intakes are basically emissions era pieces and are VERY restrictive – a good bit of work has to be done. Additionally, to work best, the carb/throttle base needs to be rotated 90 degrees from the traditional mounting. The area with the 3 large threaded holes in the middle of the runners is where coolant is introduced to the bottom of the intake to warm the incoming charge – that can all go away.
On the right side of the picture below you’ll see a small tube cast beside the #1 runner. That is the EGR passage — exhaust gas passes through a port in the head, into that little runner and then enters the intake at the base of the carb.
We’ll start by removing that EGR port — simply not needed.