Do I have a late 1g head or early 2g

Crazydsm1 · May 3, 2026

I’m thinking have a late 1g head but I need a little help here. On the side of the head by the thermostat housing it has a G6 -2 stamped on the head the water pipe branches back into the thermostat housing

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steve · May 3, 2026

Well you have a 90 CAS and a 90 TB so the odds are good it's a 90 or JDM head. What about the rest of the engine and what car is it in?

Crazydsm1 · May 3, 2026

The short block is a 6 bolt, that’s as far as I’ve gotten. I’m fixing up all the electrical issues as of right now and trying to figure out what trans is in the car as well

What do you mean by jdm head?

The 2 outer turbo manifold studs are m10’s and the rest are m8’s

steve · May 3, 2026

The outer studs being M10 would tend to point to a 92 or later head but they could have been resized as well.
I mentioned JDM because of the early TB and CAS suggested there could have been a swap to a imported pull from Japan.

1990TSIAWDTALON · May 4, 2026

I happened to have a 2g head sitting on my 6 bolt, just to keep debris out, so I took a picture of the casting of it for you.

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19Eclipse90 · May 4, 2026

From what I can recall, the G6 head has 1G style intake ports. Show us the thermostat housing / the passenger front corner of the head. For reference:

2G with 1G head and 1G intake manifold
Having trouble identifying what generation head this is
Left but head pause for 4 years… can I be still use it

The G6K and G6S are 2G heads, small intake ports and all the bolt holes for either 1G or 2G thermostat housing.

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Do I have a late 1g head or early 2g

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