turbotuner20v

I'm looking at affordable engine options to increase reliability at the 750-800whp level and saw the LSX376. Has anyone been running this engine for an extended period of time at 12+psi and ~800whp?

I have a D1SC kit that I plan to turn up and this seems like a decent option for a longblock that allows me to resell my 10k miles LS3.

This is my local dealership:

http://www.superchevyperformance.com...p/19171049.htm

I can buy online from across state lines in MO to avoid tax, so $5,402 and no shipping worries.

Thoughts?

0Taylor@DallasPerformance

Pretty cheap but wouldn't be my first pick. Compression is lower than I would like for a D1SC combo.

turbotuner20v

What would be the effects of the lower compression ratio? Poor low end/mid-range?


If I save enough on the motor, and this one can support the HP, I might consider an F1A swap down the road if that makes a difference.

0Taylor@DallasPerformance

Given the same impeller speed on the blower, the combo will take a lot more boost to make the same power. As a result, the blower combination as a whole will have less ability to make power.

turbotuner20v

Ah, I see. 10.7 to 9.0 is a pretty big drop...

I'd probably be going with one of your blower cams... what kind of options are there for milling the heads w/ the medium to aggressive grinds? How much CR do you think I could get back?

0Taylor@DallasPerformance

General rule of thumb is about a half a point for .030 milling. Basically -5cc of head volume removed = half a point of CR.

You should have no piston to valve problems if you mill the heads and run our D3 blower cam. Especially with a dish piston like that.

Milling the heads does also make the deck of the head thinner which will be more likely to distort under boost and "push water".

vrybad

Taylor,
What about the powdered rods?
Do you think they would suffice at that power/torque level?

BADZ

I would upgrade the rods with that setup.

turbotuner20v

I wonder how much money we're talking with removing the heads, milling them, swapping rods and rod bolts, reinstalling the heads...

turbotuner20v

By the time you buy the LSX376 and 'fix' it, then sell your existing LS3, it might actually be cheaper just to build the existing LS3.

FactoryRaceCar

I would personally build your LS3 block before going that route.

Corvette-Chris

turbotuner20v

Seems like HKE is the place to go, but does anyone have a middle midwest builder they recommend? I'm located in Kansas City and would like to avoid shipping the motor around if possible.

vrybad

Drewstein

Send your existing block to ERL. They have several great options. I sent my LS7 there and got a 441ci bad boy back.

old motorhead

The iron block, low compression, and substandard (for higher boost apps) rods would all run me the other way.

No.47

The end result would be lighter, but you wouldn't be able to go much past 800rwhp before you'd be pushing the limits of what the block can take. Then again the standard internals of the LSX376 probably can't go much past that either.

turbotuner20v

Probably figure $550 for assembly and balancing? $150 if it needs to be bored?

Maybe $1650 in parts for rods/pistons and misc?

5 Liter Eater

Been running the numbers to forge my LS2. Hard to get it done for less than ~$2k including main and head studs, rods, pistons, machining and balancing and LS9 gaskets.

user_name

Shipping shouldn't be too bad when avoiding sales tax.