The H&S truck is around 6500 the black Ford lightning is 4500 with weight added to it.

Tell me all about this, would like to know?

I love this guy, that is funny!

That is the 399 Skater V in the classifieds, Cummins 480hp with Arnesons, now image if you crank those Cummins up to 700hp!

JD - that was point, the $'s to tune an old mechanical engine and the hardware that needs to be built into air & fuel management you are better of with a 24V common rail.

As for your video, nice looks like great running truck, but it proves nothing - different engine, different application, different loading, a truck has little to no load coming off the line compared to a boat with submerged props.

I agree with you on 12 valve stuff. The video only proves big HP can be made with little smoke. Especially if you were not making constant adjustments to the tuning in a race...As far a load goes I don't really think being under instant load is a bad thing, a good set up that spools instantly could very easily be a good thing under instant load. The "load" will only make the turbo or turbo's come up quicker assuming we ar enot dealing with a worthless laggy setup.

JD that is why sequential turbos in boats have worked so well and not compound like the triples you mention - we're on the same path all good stuff!

Do you know if on these newer 6.7's does the piston still come up above the deck at TDC, I would have hoped they changed that.

The only diesel i have seen sequential turbo's "work" on is the Banks dragster and maybe the Banks sidewinder. But who knows really how well there working...I have zero data but I am assuming they run low boost after the first 60 ft or sooner based on the wastegates size. We tried that approach on the lightning with just a single not sequential, we had 3 very large wastegates on it and could not slow it down enough to keep it alive. They started to give up at around 100psi.

The bigger issue was the EGT's (i.e the fire out of the stack...you can see a gate under the truck blowing fire also). It would be a massive learning curve doing this in a boat obviously. Big tug of war between drivability, spool, back pressure, & EGT's. If it were me i would do triples but thats just me, the second stg we used was pretty small instant lit than blow 2 50mm gates open and bypass the energy to the primaries. After that i had one more 50mm gate at the end of the common pipe to control overall boost.

No idea about the 6.7 piston issue...

I have a LLY Duramax I'm wanting to build for a single engine cat. What tq. figures was your 800hp Duramax producing?

were going to take this skater v-bottom and try to get the bermuda challenge record back from buzzi.