Maximum rpm for SB

It depends on a number of things. Remember a 360 has a cast crank wich isnt going to be a strong as a steel crank. Weight of the piston,pin and rod is going to have a lot to do with how long the crank lives at high rpms.

My motor had 120 passes on it when it was freshend. 340 steel crank, very light pistons ans pin (525gs) re worked stock rods. The crank was replwced because it was cracking fron stress. Peak power is at 6900rpms,(shift around 7200) just under 500 horse.

Valvetrain is another big factor. Dont exect to be pulling a Hyd cam up to 7000rpms. Lidters will pump up by then. You need a good solid cam, valve springs and retainer or a roller set up to be happy up tthere. Also weight is again a factor.

You'll need good heads, intake and carb aswell.

I would say a good street motor will take 5500-6500 rpms shifts for a long time aslong as its well built.