Well, if its not turned (machined) much, and you have it balanced, along with rods balanced and wieghed, I've seen them take 600 HP and last. Thats street and strip driven. Now I dont know how much more past that they can take.
The one that was around 600 HP was in a 66 coupe. The guy that owns a Mustang Restoration shop and his friend built this bad A$$ motor for it back when they were in college. I thought he was Bull Sh!ttin till a few other people I met knew him and all they talked about was the 66 Coupe. They said it ran low 11's in the quarter mile at 119 miles an hour.
Anyway, the guy who owns the shop said they drove that car all over, on the streets, on the track, for two years. Then it took and accidental 9500 RPM blast. It then broke in half, well the crank did.
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