LQ4 into a 3rd Gen/1972 Nova by frojoe

3 minute(s) of a 891 minute read

So after leaving this thread dormant for a long-*** time, here's a small update.

I put on some JBA tubular headers just to roughly see the fitment. Not sure if I'm gonna use these or not, they have lots of ugly emissions junk on them I'd have to smooth off, not to mention re-weld a V-band flange, as well as them going quite up and out from the block. Hot side tubing might be pretty tight on the pass. side since the turbo would be a "top mount" and the pass. side tube would have to bend down and then back up to merge into the turbine inlet, all right where the coolant lines and lower radiator are









PS... thanks MARK for the usage of your headers for "fitment".. I think I might end up keeping them... But, I might lean towards Vette iron manifolds or something if they tuck tighter to the block, plus they're stronger to avoid tubular cracking, and the collector is more towards the middle of the block than the front...



Finally, here's the beast...



Holset turbo from an '08 6.7L Cummins. It's called the HE351VGT or HE351VE-VNT, from what I can gather from the intranets (info is very scarce:

-free with minuscule shaft play

-68mm compressor

-.73 exhaust A/R

-oil-lubed journal bearing with water-cooled bearing housing

-variable geometry (duh), Bosch servo controls the turbine cross-sectional area (acts as an internal wastegate on the diesels, that's how they engine brake on the pickups), would need external WG for piece-of-mind

-good for ~600hp on a 6.7L engine @ 3500-4000rpm, I figure 500 for 6.0L @ 6000rpm should be reasonable. I have yet to find a compressor map for it but I have for the HE351VE which I'm hoping is just the dumber non-VNT version of it. Also lots of info for the HE351CW, which sounds similar but came on the 5.9L and I think is a pretty different turbo.

-for my hopes (500hp to the wheels), engine needs to flow about 35lbs/min of air at 10-12psi, and it looks like this is still within the efficient range for this turbo even though it's OEM-spec for 30+psi applications (some of those crazy diesel guys are piggyback-chipping those motors and getting 60+psi out of these turbos)

Or should I just twin...??