I put about 2000 miles on my car at 630 whp on stock sleeves. It never skipped a beat. Now the tq numbers which are really the important figures as I've been told are only around 430 right now.

I plan to go e85 and push it to 700whp and 475-500 tq. I beat the car pretty good and will continue to do so , if it breaks so be it but I think with my setup it will take it for a while.

 

Torque breaks rods...cylinder pressure and heat screw sleeves. Broken rods break them too though

Just because you haven't had issues doesn't mean its a good idea. It's always better to sleeve if you can, no question.

700whp on stock sleeves has been done, but not recommended by any real evo shop.

 

well e85 should certainly reduce some heat. I would assume I would see some stretch in the #4 cyl before a failure. I am gonna push it and hopefully it doesnt grenade. If it stretches the sleeve then I'll get the block sleeved. If it grenades then I guess I'll be shopping for a new shortblock.