**600hp sbm block limit? Or is it bs!!**

Supershafts said

I never used a stud girdle and put in 400hp on 2 stgs, i have broke cranks, pushed out gaskets, but not the block using n2o, but i leave off idle on the system and that seems to play mayhem on the bearings which will make them need changing more often.

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If i understand your post, you leave off idle with nitrous flowing? If so, the cylinder pressure would be through the roof. A 100 hp shot at 2600 rpm adds over 200 ft lbs torque at that rpm, and the horendous cylinder pressure to create it. No wonder there has been mayhem!