Ported Intake Manifold – Stage 1
Please subscribe to the YouTube channel if you have not already. Also, find us on Facebook and Instagram as Purist Motorsports. Don’t forget to like and share our content.
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.