[LT4Greg]

Originally Posted by ZL1with1LE

Two months ago I added a Rotofab intake, DSX flex fuel sensor & dyno tune from MSorian, my 1LE made 580whp/541wtq on 93 & 598whp/554wtq on E60 blend. Sorian said he couldn't really push the timing too much because the stock cats would blow out, I was completely fine with that and the car has been great.. but I'm a bit used to the power now.

Fast forward 2 months.. my new bolt ons just arrived! CSP headers, ATI damper & 9.17 lower pulley, Weapon-X heat exchangers and one step colder NGK plugs. It'll all go on this weekend and back to Sorian she goes next week! Any guesses on how much whp/wtq she'll make now?

Just hope your oil pump is good to go. I would upgrade to a better one if you add more hp.

[Markoz28]

The short block is incredibly strong and let’s be realistic anything past 1000whp is just insane.

The only well known limitations are fueling and the 1.7 supercharger. With cam, 2650 SC, and low side booster 850whp is almost a guarantee.

[ZX-10R]

Originally Posted by ZL1with1LE

Sorian said he couldn't really push the timing too much because the stock cats would blow out

Interesting, I though it was rich fueling that caused early cat failure

Oh and 800 hp would get boring too, that's how it works

[SFV1LE]

Originally Posted by Joshinator99

I’d push an LT4 shortblock without thinking twice. The issues I’ve seen are few and far between. Usually over 1000 wheel and/or a tuning issue are what do them in.

IMHO you should not be worried about the block itself, or shopping for a billet block. This super sturdy closed deck block should be good for over 1000 WHP with a high-quality, balanced engine build.

What breaks first at high power levels are pistons, rods and bearings, not the block and cylinders. And to your point, with our existing forged rods/pistons that is almost always due to a bad tune and not excessive power. But to strengthen the motor, you just upgrade the rods/pistons.

Detonation from a bad tune is usually what cracks pistons and hammers rods until they bend or snap and/or distort bearings.