Quote Originally Posted by wstefan20 View Post
The main reason is that by blocking the coolant ports here, you can remove the supercharger/ upper plenum and throttle body without having to drain and bleed the coolant system.

Other main one is those wanting to run an intercooler.

There's other minor reasons that all have their controversy, like it keeps your throttle body colder, you can use throttle body spacers, less likely to leak, L36 coolant and egr issue resolved, etc. (I'm sure I'm missing a free)

The porting is to try to increase the coolant flow rate, especially if the throttle body is bypassed since you are removing that branch of the coolant flow. This is highly debatable, but I'm running nearly 10 degrees cooler on a stock system and thermostat after the port.

Hope this helps!
I'm role'n with an 04 Pontiac Grand Prix Supercharged... Hmm, I might look into how to properly do that.

This is off topic but if you get this and know anything about this please chime in. Recently put in 3' downpipe zzp. 1

1. I only can get one dog bone in because the super strain fit of the downpipe.

2. My Scangauge Boost reading in the negatives when gas is on the peddle. Exhaust leak??

3. My back o2 sensor not plugged in all the way due to the tight fit on the wall and mainly because where the bung is located.

FYI, Just have downpipe for my exhaust work. Installing plog tomorrow..

Thanks if you took the time to read and chime in

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