7 bolt Y3-5 head questions

[Derek232]

I'm doing a 6bolt bottom end with a 7bolt head on my auto 1g. Just picked up a 7bolt head and the casting numbers on it are Y3 and then underneath the Y3 there is a 5. I've tried searching around and haven't come up with anything on what the head came off of. Just want to make sure it's going to work for what I'm trying to do. Any help will be appreciated.

 

[spyderdrifter]

Could you post up some pictures of the location of these markings? I have a 6 bolt bottom with 7 bolt head. If you show some pictures, I could reference my cars head since I know mine has the original head.

 

[Derek232]

I have a feeling it isn't a 2.0 head

 

[spyderdrifter]

Wow, that does not look like a normal. Maybe someone with better info can add in. I've never seen a head with rounded intake ports before.

 

[ThunderChild]

Looks like a 4g61 or 4g67 head from a mirage/colt etc. Possibly a Hyundai head off a 1.6.

Look at the pics in THIS search.

 

[d1prospect]

I have a spare 2g in my storage. I'll check this afternoon for you. Intake ports look right for a stock 2g head

 

[donniekak]

Looks like a hyundai head. Small ports, and the 1g water housing bolt pattern.

 

[Derek232]

Looks like a hyundai head. Small ports, and the 1g water housing bolt pattern.

So how do the 1.6 heads compare to the 2.0 heads? I've heard it can raise the compression because the cylinder relief is smaller. Do they take different valves, springs or anything else?

 

[donniekak]

Some of them have smaller combustion chambers raising compression. The valvetrain should be the same dimensions.

 

[d1prospect]

This is my 2ga head

 

[ThunderChild]

So how do the 1.6 heads compare to the 2.0 heads? I've heard it can raise the compression because the cylinder relief is smaller. Do they take different valves, springs or anything else?

From what I've found, 1.6 heads have the same CC volume as DSM heads, where SOME 1.8 Hyundai heads have the smaller CC. there is a pic of my 1.8 head with the smaller CC HERE compared to a stock 1g head CC, post #5.

According to my calcs when I assembled my engine, i went from stock 7.8:1 compression to ~8.2:1 with the smaller chambered head.

Im using all stock valve train, seems to be a great head so far. I suspect your 2g style would be good for velocity and mileage at sub-6k rpm situations, but that's purely speculation.