The 70.4 mm crank breakage problem was solved within a year or so of the debut of the long-stroke 2.5's ... a specially-radiused version that required special bearings was used on all 2.8 and 3.0 RSR's!
That problem discovered in the long-stroke2.5 race engine is why BA recommends that stock 70.4 mm cranks be limited to the 7500-7800 rpm range for best durability!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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