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Both the 2.2 and 2.7 are mag case engines. The case in the 2.2 is one of the weakest of the mag cases. The 7R case for the 2.7 is one of the strongest. Both cases will probably need some work to use. Case savers for head studs, inserts for some of the other critical case threads, oil bypass mod (2.7 case may already have this). Mains checked and case machined as needed. Cylinder mating surfaces decked as needed. The work to make either case usable will probably be about the same.
Are the 2.2 cylinders Biral cast iron with aluminum outer fins (this is factory) or late piston and cylinder set with Nikasil cylinders? If Biral they can be bored larger and new pistons used.
JE does not make cylinders only pistons. Factory 2.7 cylinders can be reused if Nikasil and in spec or re-plated for use the JE pistons.
Since you have two engines to pull parts from you could make a 2.2, or 2.4 or long stroke 2.5 from the 2.2 (larger displacement needs crank from 2.7) with final displacement dependent on bore. With the 2.7 you could build a 2.5 short stroke (use 2.2 66mm crank) or 2.7-2.9 depending on cylinder bore choice.
I assume you are using Carbs to day so they should be able to be repurposed for use with any of the above combinations.
I would vote for 2.7-2.9 with Mod S cams. I have had a 2.4 E spec motor and a 2.7 RS+ with Mod S cams in my 914-6 conversion in the last year and the 2.7 wins hands down.
There are several similar thread in the engine rebuilding forum you might want to check out.
john
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