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If you have a EA case and they listed your engine as a 2.1, the possible combo is 96mm cylinders and stock 2.0 (71mm) crank (2056 cc). The other way is stock 2.0 cylinders and a stroker crank, maybe 74mm (2055 cc). In reality, there are many combos.
The only mod required would be to the case. The cylinder holes would have been machined to accept the 96mm bore. The 2.0 heads will accept the 96mm cylinders without further machining as I remember.
To fix it, use a GA or GC 2.0 case. Or if you use a 1.7/1.8 (W, EA, EB, EC) case, have the cylinder holes machined to accept the 96mm cylinders.
Using a brand new case (green case) may not be the best option. The components of an engine go thru heat cycles in use. Core shift can occur during these heat cycles, creating a slight misalingment from factory specifications.
"Used" cases (seasoned case) have already undergone heat cycling. When machined, they hold the tolerances better as any core shift has already occurred.
If you desire, email me as I have a couple of 2.0 bare cases and several 1.7/1.8 engines.
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"Inventor - Blue Flame 914 Seat Heater"
"Yellow Rusty Cars Are Faster"
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'70 2.5 (I'll never finish it - Somewhere over the rainbow.....,)
'73 2.0 (Just Not The Same)
'74 2.0 (Heartless & Lungless)
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