The 2.0 vanagon heads will be square ports on the exhaust so the customer
will probably need a new exchanger/exhaust system as well.

Vanagon/2.0 heads will start with a 071 part number, while the 1.8ltr will
be a 022

Valves on a 1.8 are 39 x 33mm Valves

http://vwparts.aircooled.net/Cylinder-Head-Square-Port-1979-1-2-83-Type-4-VW-p/071-101-061d.htm

If the are 071 heads then they are 39.3mm intake valves and 33mm exhaust
valves,

On Jan 5, 2018 11:07 AM, "kenneth wilford (Van-Again)" <kenwilfy@comcast.net>
wrote:

I have a customer that has an 1800cc VW Bus.  He wants to buy a new set of
heads.  I have a set for a 2000cc Bus (oval exhaust ports).  I know the
1800cc head actually have bigger valves than the 2.0l heads but is there
anything that would be a problem using the 2.0l heads on an 1.8l Type IV
engine?  I have been researching this and haven't really found a definite
answer on thesamba so I thought I would ask you folks.

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com