[unometeeter]

Title is the question, how much hp is the block good for before cylinder sleeves are needed?
(Assuming you have built internals)
Maybe so for track/drag cars, but daily drivers running 700-900 hp are ok?

 

[BPAuto2]

There are several people running 1000hp+ on non-sleeved blocks.

 

[heacuva]

i think there are more than just the sleeves in order to make these blocks bulletproof for 1000+whp continous power. many blocks (both sleeved and reinforced with liners) have been totaled due to block cracking at high torque numbers.

 

[MindlessOath]

The block only needs to be reinforced to handle a lot of power. Liners and sleeves all depends on you or your tuners preference. Switzer doesn't use any liners/sleeves iirc. Ams and greddy do.

 

[Neil Switzer]

Correct, 3.8L stock block and 1250awhp/1000awtq on a MD.