Most all blocks besides the 500557 are fine 5-600hp.
Some are better. H.O. and RA blocks are beefy'r.
Have used the 557's in street 450-475hp/48-5200rpm levels without problems.
Dont rec any n2o.
Kinda like stock rods vs aftrmrkt.
After building a few, and noticing differences, you start thinking; "where's the beef", and do i did more?
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