A production roller block can handle 550 hp, seen some people here talking about 600 hp (plus MM&FF had a guy runng 600 hp with a stock block). I think Ford rates the production block now 450 hp @ 6500 rpm? I'll have to check.
IMO if your 600hp N/A its easier on the block than with a power adder. NOS was blowing stock 5.0's apart with a 250 to 300 shots (all at once rather than slowly adding on the N2O).
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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