pour molten aluminum into your water jackets, and done

 

Stock sleeves are strong, just don't denotate them. If you do a block block it isn't going to help at all. I've seen more issues due to block guards than they prevent.

i've had stock sleeves over 30lbs w/o any issues.

Just make sure to find a tuner who knows what hes doing, and you'll be fine.

 

Stock sleeves or if you want peace of mind Golden Eagle will sleeve your block.