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Discussion Starter #1
...for racing. I got two of em, one bored sixty over with no core shift, align bored with steel splayed main caps. I was gonna use the stock crank(10/10 & steel!) with H beam PF steel rods & KB hyperutectic pistons for a 412 ci package. I'm thinking now of a stroker in the range of 427+ ci. Problems seem to center on the small base camshaft & rod bolt clearance which can be accomadated, barely! My question is the durability of the 400 block bored to this tolerance. When a higher compresion like 13:1+ Mahle pistons is considered, FF H beam rods NOS & 8000 RPM my concern is block fatigue. Even if I fill the lower part of the water jackets with block filler a combo like this may well tweak the block & my wallet. I got a hot deal on it as the block was free as well the machine work. Problem is a GM rocket block or after market block will be consideribly stronger, & cam & block clearance problems are gone, plus even bigger ci combos. Cost shoots to the moon also!!! Comments welcomed!
 
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I believe the block that you are talking about started as a Diesel, hence is cast iron, but I am not too familiar with any of what you mentioned. It wouldn't make too much sense to increase the clearance if you don't know what material your pistons are, because increasing clearance also means your lubricant delivery will have to be much more efficient and your weight will increase. Also if you are using an Iron block is more likely that it will outlast any steel or aluminum block for racing, however using Nitrous Oxide can be a problem if the mixture runs too cool, can crack your block, At 8000 RMP your consern should be your crank not your block if is iron that is, but if is Steel or Aluminum be aware that it will wear fast, and probably will need to machine after a few runs. Also What kind of head are you using?
 
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