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?

[wonkipop]

yeah.
so the engine number in mine is EC 015941. its a jan 74 car.

but all those engine numbers on lists above contain 7 numbers.
for instance last engine of 74 is listed as EC0037551.
if you found the actual engine the stamp on the engine would be EC037551.

so that engine above is 4,900.
if its not from a 412 1.8 which did start production in aug 73 - 3 months before the 914 1.8 in late oct/early nov 73 then i think its from a very early 74MY 914 1.8. probably amongst the first.