Ported Intake Manifold – Stage 1

By: Bob Goodson
September 22, 2021

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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.

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