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Discussion Starter · #1 ·
Hi all,

I'm preparing to build a set of custom headers for my D16Y8 head, but have not disassembled anything as yet and I'm hoping someone may either have dimensions handy or a Y8 head that is lying around that they could measure up easily. I have tried searching, but can't seem to locate this info on any of the forums.

I need the width and height of the exhaust ports and the length of the port inside the head, both as per the attached images.

Thanks in advance for any help!
 

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But you have a d16y8 head?
 
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Discussion Starter · #3 ·
I do, but hoping that someone may have these measurements easily available, so I don't have to dismantle my car to do some calculations for the header design.
 

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Discussion Starter · #5 ·
Is the y8 the same casting as the y7? If so, I have a y7 head on the bench and I can get those dimension today sometime.
Hey Henry,

I've been reading up and it seems the y7 and y8 are the same casting, and from what I read the same exhaust port size.

If it is easy enough for you to measure up, it would really help out so I can start some designs.

Many thanks!
 

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Hey Henry,

I've been reading up and it seems the y7 and y8 are the same casting, and from what I read the same exhaust port size.

If it is easy enough for you to measure up, it would really help out so I can start some designs.

Many thanks!
No problem. I'll take a look tomorrow, then. In mm or inches?
 

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Here you go.
The port opening:
28.72mm x 39.21mm
the port length:
82.65mm
The port opening dimensions are pretty accurate. The port length is a bit more of an approximation. I bent a piece of wire to follow your drawing, marked it, straightened it out, then measured it. I was a careful as I could be, but I'm sure I didn't get things exact.
 

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Discussion Starter · #9 ·
Hey Henry,

You're an absolute legend.

The length is a tricky one to measure, but I can't fault your method.

Thanks for going to the trouble to do this. Much appreciated!
 
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