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Mon Feb 06, 2006 1:03 am

What size valves come standard on the VW 043 head?

Mon Feb 06, 2006 3:54 am

I think 40x35 is the "standard" valve size for them.

Mon Feb 06, 2006 8:19 am

The 043 was a F.I head and I think the valve's where 34 x 32 which were even smaler then a carb engine. But now in day you may find 043 casting with all type's of valve size's check these 043 head out.

https://www.thesamba.com/vw/classifieds/pix/1039559.jpg

Mon Feb 06, 2006 8:21 am

steel buggin wrote:

Nice ports.

Mon Feb 06, 2006 8:23 am

THANKS :shock:

Mon Feb 06, 2006 9:53 am

you could LIVE in those ports, steelbuggin. :D

-jesse

Mon Feb 06, 2006 12:43 pm

33 X 30, 35 X 32, 40 X 35, and 42 X 37.5 have all been used in that head. There is no "stock" size, you must measure them.

John
Aircooled.Net Inc.

Mon Aug 18, 2014 4:22 pm

[email protected] wrote: 33 X 30, 35 X 32, 40 X 35, and 42 X 37.5 have all been used in that head. There is no "stock" size, you must measure them.

John
Aircooled.Net Inc.

Hi folks, I've bare 043 heads with no seats, just the seat bores, and I'm having a hard time trying to source a 30mm valve seat and a 30mm valve. But it just occurred to me that I've no idea if that's definitely what I need, or maybe it's possible for me to ram a 32mm in there, cos it depends on the OD, ID and the valve seating surface I'd assume. So how the fu*k does one work that out? Like if it was a 30mm exhaust valve, what would the OD, ID of the seat need to be? And what'd the valve sealing surface be? 1mm or wha? And I know everyone will say, send it to a machine shop, and maybe I will, but what magical knowledge do they have to help them choose? Anyone able to guide me?

Mon Aug 18, 2014 4:41 pm

Sure. The seat OD should be about 1mm larger than the valve, there is some wiggle room to go either way.

In a OE VW head the seats are peened over making them appear smaller from the outside.

you can fit the seats to the head, or fit the head to the seats, but of course this requires a VGS machine and a lathe, which I'm guessing you don't have.

Also, most valves can be made smaller. Can't make em bigger tho :wink:

Wed Aug 20, 2014 2:13 pm

Thanks Modok. I don't have a lathe or VGS machine. Thanks for the info and tips, they may give me some latitude of approach once I measure up the bores again...

Wed Aug 20, 2014 2:17 pm

The first thing they do is measure them, which you seem to be averse to.

Wed Aug 20, 2014 3:10 pm

[email protected] wrote: The first thing they do is measure them, which you seem to be averse to.

A hasty conclusion and a smartass answer, John. I did measure them some time back, that's why I said I was trying to find a 30mm valve. Put some lotion on it.