The only iron block Pontiac I've built that could possibly have been a "block breaker" was the blown alky 400 I used in mini-rod pulling for most of two seasons (my guesstimate is 750 HP). Sorry though, no failure data for you- the short block is still together and healthy after many 8,300 RPM runs. Not a bunch of lightweight parts- I'd have to look up some of the numbers (heavy JE blower pistons and pins, old M/T rods, 84 pound crank, etc.) I feel that the full counterweighting of the crank was a big help. Plus not making much torque down low (mild lift, long duration cams) helps avoid block stresses.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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