Topic: lower 750 engine case compatibility

[nteek754]

Hey all in my last post about remote oil filter because of a wasted  threads for the oil filter/canister well I now am looking to replace the bottom case and  wonder if I just get another 1978 case if they are an automatic match or are there other differances thanx for any input  Craig

[Bob Wessner]

It's my understanding that the upper and lower cases are matched during the production process. The mating surfaces are machined to match that is. I don't believe upper and lowers are compatable from different engines without some serious work that I'm not sure most can perform.

[MRieck]

You will need the matched set. You can get away with swapping uppers and lowers (most of the time) on new engines but that's about it.

[Tim.]

You might consider repairing and using one of these:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4553506609

So you don't have to use the repaired threads any more.