1.7/1.8 engine case difference? Options

[Sm914650]

Curious if anyone could tell me if there is a difference between 1.8 and 1.7 cases if I were to use a 1.8 case on a 1.7 engine?

[Shivers]

http://www.volksbolts.com/faq/eng-codes.htm

[wonkipop]

http://www.volksbolts.com/faq/eng-codes.htm

yeah well that list isn't worth the electrons its printed on.
doesn't even list the EC as 75, when we know full well it was.

@Sm914650 .
definitely trippy mate.
great you posted the photo. yep thats a 9.

i really don't know.
by 1975 the only car the EC is in is the 914. i'm 99% on that.
it was in the VW 412 in 1974 along with the 914 - hence the high engine number count.

(the even rarer version is the AN, twin carb 1.8 for europe in 75. off the top of my head the number is 101 units. or maybe its 99. but thats all there was and thats all the 75 euro spec 1.8s that were made.).

the only thing i can possibly think of is maybe its an industrial engine case.
but i know nothing about those. there were type 4 industrial engines.
but somehow i doubt they were EC engines.
the EC is very specific, it applies to the 1.8 low compression engine for unleaded fuel.
its USA market only. and its only 74 and 75 to the best of my knowledge.