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columbiA · 01-31-2012, 10:54 PM

Back in 1960,I bought an early 2-port Riley-with plugs on RH side & put it on a stock A engine with fiber timing gear & put over 75,000 miles on it.In the mid 80,s I put the same head on an A block with a drilled 33 B crank with mains cut down to 1-13/16" & heavy steel main caps made up for front & center mains.Also used a special oil pump & alum timing gear,light F-wheel,large updraft carb etc.It would really perform & I put many more miles on it. As for broken crank shafts,a fellow gave me an A block with a brokenC-S.It had the full circle C weights shrunk & pinned on & brgs brought back to std,but I could see that the radius on the journals was to sharp & that was where it failed Even eyeballing it,you could see several other crank pins starting to crack.Crank must have been ground by someone used to grinding heavy modern cranks & not useing the proper radius.

01-31-2012, 10:54 PM	#37
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: Day goes from good to bad in one shift Back in 1960,I bought an early 2-port Riley-with plugs on RH side & put it on a stock A engine with fiber timing gear & put over 75,000 miles on it.In the mid 80,s I put the same head on an A block with a drilled 33 B crank with mains cut down to 1-13/16" & heavy steel main caps made up for front & center mains.Also used a special oil pump & alum timing gear,light F-wheel,large updraft carb etc.It would really perform & I put many more miles on it. As for broken crank shafts,a fellow gave me an A block with a brokenC-S.It had the full circle C weights shrunk & pinned on & brgs brought back to std,but I could see that the radius on the journals was to sharp & that was where it failed Even eyeballing it,you could see several other crank pins starting to crack.Crank must have been ground by someone used to grinding heavy modern cranks & not useing the proper radius.