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Bert,
Just went out (it freezes here outside) and measured both exhausts:
The 1800 engine is approximately 645 mm between the (middle) bolt holes you mentioned. It is not a very accurate measurement mind you.
The 2000 engine (a CU example) is appr. 650 mm between the bolt holes (was easier to measure).
I hope that helps you a bit.
BTW I thought you had build a very nice type 1 engine with full flow and all?
Glad you are going to explore the type 4 :-)
Greetings,
Walter
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