What intake manifold is this?

[rdeis]

Hello, all. Found an unfamiliar part on a frankenstein build I picked up. Can anyone identify this cast manifold?

Car is a 1G, but the manifold is not. Thanks in advance!

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[Justin DuBois]

2G Intake manifold. Do you have a 2G head also?

 

[rdeis]

I didn't think so, but I could be wrong. Most of my experience is 1Gb.

It's got the big round cam sensor on the car's right side like I'd expect of a 1G. 7 Bolt bottom end. Thermostat housing looks like a 1G-- what are the telltales I can look for?

 

[jdxnc]

You can put the 1g cam sensor on both 1g and 2g heads. The real tell will be the thermostat housing bolt location, 1g is 3 holes, 2g is 5, considering you have a 1g, there should be 2 holes right under the head turbo feed port that are unused.

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[Justin DuBois]

The intake ports on a 1G are much larger than the intake ports on a 2G head, and considering you have a 2G intake manifold I’d be super curious to see how they mated these two incompatible parts. Who knows what kind of shenanigans they did. It might be ported or filled, or nothing.

Also curious on how they mated 1G Throttle Body to the 2G IM, 1G TB is bigger than a 2G TB

 

[rdeis]

2G head, the two unused bolt holes are right there where you said to look, thanks! I'll take a look at the TB/Manifold joint when I have a moment to tear it apart.

I've seen a lot of comments saying that 1G head is better for some applications, 2G is better for others. Is there a good thread on relative advantages of the two heads?

This car is mostly a backup daily driver for when I'm working on my nicer one, but it's a good opportunity to learn some things I haven't dealt with before. Eventually I'll restore it to something that's nice, clean, and tight and pass it on.

 

[Justin DuBois]

2G head, the two unused bolt holes are right there where you said to look, thanks! I'll take a look at the TB/Manifold joint when I have a moment to tear it apart.

I've seen a lot of comments saying that 1G head is better for some applications, 2G is better for others. Is there a good thread on relative advantages of the two heads?

This car is mostly a backup daily driver for when I'm working on my nicer one, but it's a good opportunity to learn some things I haven't dealt with before. Eventually I'll restore it to something that's nice, clean, and tight and pass it on.

The most important thing is that the ports match so there is a smooth transition, but as to the large runner vs small runner my thinking is smaller = higher velocity at a lower volume = responsive. It flys in the face of the bigger is better dogma. I'll say this - EVO race cars run over 500whp with a stock intake manifold. It's not a part you need to change - there are other places to make changes.

 

[rdeis]

Thx! I expect 400 with a lot of midrange response is enough to keep me happy.

The nice car is a stroker and coming along very well. Chasing down a couple of sensors and irritating intake leaks right now, but enjoying the drive immensely despots the mediocre tune.

Perhaps I’ll swap the heads between that one and this one some day soon.