My block had that same hole in it but it also looked like a V6 engine with two HUGE cylinders lol I was missions some walls on the inside of my block and I have no clue where one of my pistons went lol we only found 6 rods and 7 pistons but allot of metal shavings in my oil pan haha
From my research, it is to get as much HP as you can with no more than 10lbs of boots... It isn't the HP that blows it, it's the boost level that does...
Well then run 10psi and a 100 shot of nitrous and call it a day. Alternative auto ran 17psi on the stock block for quite a few 1/4 mile passes before finally blowing it.
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whipple HO SC,FRPP springs, Pypes mid mufflers, Che adj. LCA, hurst, 4.10's, 1 piece DS, spec stg 2 clutch. Accel coils 12.52@117.6mph so far with a 2.01 60 ft time(pre shaft, coils, clutch).
I think tuned for 12 PSI is the absolute limit and that is if you have the luck of the Irish too. I saw a guy post that he vented his block at 8 PSI on a KB 2.4 with the KB tune. There are a lot of factors that can contribute to early rod failure beside the boost level. Needless to say if you really want a reliable motor to push at the track frequently then you need to be forged. I am just not ready to drop the green on a entire longblock yet, but may be forced to when I vent my own block.
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RE: 540 HP...How? - 
