[KingLT1]

Originally Posted by radz28

Didn’t Katech take push an LT4 TT long block past, like 1300 FWHP and an TT LT5 to, like, 1400 before it bent rods, too, or something? I know LT5s cranks are slightly improved, too. Coyotes bend cranks, too, apparently. I think Roush just posted they have a shortened hub, or something to keep the blower mess as close to the block as possible.

Yes but I believe Lingenfelter did it first. 1400hp LT4 on an engine dyno with twins and E85.

[JSH]

Originally Posted by dreksnot

So, is 750-850rwhp a realistic range for an SBE LT4 to live a relative good and long life, of course, with a great tune and fuel?

I think so, but you know me, I would upgrade the valve train

[KingLT1]

JSH let go at the power it did because he has to spin the blower a lot harder to make that power vs sea level(which is the same thing you will be dealing with). At sea level his setup would have been trying to push closer to 23psi and make 1100whp. It's the crank flex from the supercharger pulling on the crank that tears them up.

I agree with what he is saying that at his elevation 900whp uncorrected will be pushing the limits of the SBE. I would say keep it around 750-800whp uncorrected.

[JSH]

Originally Posted by KingLT1

I agree with what he is saying that at his elevation 900whp uncorrected will be pushing the limits of the SBE. I would say keep it around 750-800whp uncorrected.

Let's not revisit liking or disliking Hennessey, but they and KaTech told me in 2020 that 1000 crank or 850 wheel are reasonably safe max. numbers for the LT4. I believe I recall that KaTech saying they had made 900 wheel for a few customers. So, all of this ties together.