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I hate to disagree with our host, but 2.4 Ts, unlike earlier versions, did have counterweighted cranks. In addtion, some had 7R cases. While not as strong as aluminum, a 7R or 5R should do the job, while saving a considerable amount of weight. Also, 2.4Ts (and 2.2Ts, for that matter) had the same size valves as 2.2 and 2.4 Es, Ss, and even the 2.7 RS. The ports are, however, smaller.
-Scott
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'70 911E short stroke 2.5 MFI. Sold 
'56 Cliff May Prefab
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