I BOUGHT THIS never run NEW MOTOR FROM A GUY GETTING A DEVORCE...FOR LESS THAN 1/2 PRICE.

So what turbos should I run 2-VS78/75? - 2002 Silverado 4X4 with 4l80e
looking to run 25-30#s of boost
65% street and some drag racing
I don't have any power goals, just going to accept what I get out of the motor with up to 30#s.
will run 15# most of the time and up to 30# at the track.
just a fun fast truck.


LSX376-B15 Tech Specs

• Part Number: 19355575
• Engine Type: LSX-Series Gen-IV Small-Block V-8
• Displacement (cu. in.): 376 (6.2L)
• Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92 mm)
• Block (P/N 19260095): LSX cast-iron with six-bolt, cross-bolted main caps
• Crankshaft (P/N 12603616): Forged steel
• Connecting Rods (P/N 12604857): Forged powdered metal
• Pistons (P/N 19259381): Forged aluminum
• Camshaft Type (P/N 12638426): Hydraulic roller
• Valve Lift (in.): 0.560 intake / 0.555 exhaust
• Camshaft Duration (@0.050 in.): 210° intake / 230° exhaust
• Cylinder Heads (P/N 19201805): LSX-LS3 rectangular port; with “as cast” 68-cc chambers/six-bolt attachment
• Valve Size (in.): 2.160 intake / 1.550 exhaust
• Compression ratio: 9.0:1
• Rocker Arms (P/N 12669995 int): Investment-cast, roll trunnion
• Rocker Arms (P/N 12681275 exh): Investment-cast, roll trunnion
• Rocker Arm Ratio: 1.7:1
• Recommended Fuel: Regular pump
• Maximum Recommended rpm: 6600
• Reluctor Wheel: 58X
• Balanced: Internal

 

Do you come from imports by chance? 30lbs is a toooooon of boost in an LS. Hell, most trucks can't hook with 10-12lbs

either way, can't help you with the turbo size, just wanted to pop in and say you're gonna need a helluva fuel system, trans and rear ending to hold that thing at 30lbs, if you get there. Be ready to drop 10-15k on running and suspension gear to couple that power to the road

 

👏

Isn't that cam very wrong for turbocharging?
Maybe this will work if he runs straight methanol?

 

Import Guy = NOT nothing against them tho. they push 30# to make 450-500HP, this isn't my first Silverado with boost. I did a on3 when the first cam out back in 2013 / 2014 and sold it at Barrett Jackson for $18k plus, then build an on3 Ls 6.0 in a YJ jeep and sold the at Barrett Jackson. that jeep was crazy.
Yes 30#s is a lot of boost
a lot of the LS magazines have run this motor up that high but not with twins. ( that I can find )
I have almost all the supporting chassis & Fuel stuff needed . still adding a few as I learn.

 

That B15 LSX is nice!

 

it’s a shame they don’t use a better rotating assembly and head studs though.

 

YES & YES to both

 

Is the rotating assb inferior? Guess GM studs too?

 

Well its better then the stock 5.3-6.2 motors and sloppy Matt and other guys run used parts with Great success and GM performance Lead guy Rocky told me don't change anything and turbo it, "you Might Be Surprised and the valve train is supper Lazier Stable" SO Lets See What It Can Do in the real driveway Mechanics world.

HOPE I DONT BLOW IT UP!
I going to use Holley Terminator X for tuning.

 

Go for it! You going to compound or sequential it?