Torque! Rocket power vs LS power

[High Roller]

Interested to hear the specs on this SBO.

Mine is a simple build, about 10-12yrs ago.
374 Olds (4.125 bore x 3.500 stroke)
750 Holley
RPM Intake - gasket ported
9.7:1 compression
Diamond Pistons
Total Seal Rings
CP Wrist Pins
GRP Rods 4340
Fact Forged 330 Crankshaft
Strange Magic Cam HYD
HS Roller Rockers
#7 Heads
ARP Main studs & straps
Moroso pan
Hooker Super Comp Headers
32* total timing

 

[olds307 and 403]

Mine is a simple build, about 10-12yrs ago.
374 Olds (4.125 bore x 3.500 stroke)
750 Holley
RPM Intake - gasket ported
9.7:1 compression
Diamond Pistons
Total Seal Rings
CP Wrist Pins
GRP Rods 4340
Fact Forged 330 Crankshaft
Strange Magic Cam HYD
HS Roller Rockers
#7 Heads
ARP Main studs & straps
Moroso pan
Hooker Super Comp Headers
32* total timing

Looks like a nice combo. What was done to heads? I assume W31 valves?

 

[olds307 and 403]

I just did...catch some fish this weekend...nice weather here but probably cooling down pretty fast up there

I work tomorrow. We may sit at the reservoir Sunday. It takes a lot out of my Wife to sit in the boat and cast a rod. Our trolling motor died, not supposed to use a gas motor on the reservoir. Still waiting on my crank from the balancing shop.

 

[High Roller]

Looks like a nice combo. What was done to heads? I assume W31 valves?

With that bore I installed 2.07/1.68 only little pocket port from bigger valves, good valve job.
#7A Head Flow
Intake exhaust
.100 67 60
.200 141 113
.300 203 158
.400 237 186
.500 250 194
.600 253

 

[olds307 and 403]

Those are very impressive numbers. They flow 210/170 with a bowl hog, minor blend and 2"/1.625" valves. Stock is 190/160. My #6 just have a bowl hog on both sides, 2.07/1.56" valves and machined for positive seals.

 

[olds307 and 403]

Was this an Andy Miller build?

 

[High Roller]

Was this an Andy Miller build?

I did get some parts from him, and had Knowlton's build it

 

[olds307 and 403]

So I took the Six Liter Slug, our 2011 GMC 2500 Quad Cab 4x4 for a drive, not towing. It had an empty skid tank and two 205L of 15W40 and Trans Hydraulic Fluid. Supposedly it weighs nearly 6400 pounds empty. It is rated at 360 hp and 380 ft/lbs. It has the 6L 6spd auto. Climbing the valley, 3500 rpm, even empty on the way back or forget climbing the valley hill above 80 km/hr. It gets feed only 91 octane non ethanol Premium. My 4100 pound Dodge Challenger with a measly 268 ft/lbs of torque rarely needs to go above 2500 rpm to climb the same valley hills. Mostly 87 octane 10% ethanol Regular. I wonder if my boss will let me put those graphics on the truck?

 

[ck80]

So I took the Six Liter Slug, our 2011 GMC 2500 Quad Cab 4x4 for a drive, not towing. It had an empty skid tank and two 205L of 15W40 and Trans Hydraulic Fluid. Supposedly it weighs nearly 6400 pounds empty. It is rated at 360 hp and 380 ft/lbs. It has the 6L 6spd auto. Climbing the valley, 3500 rpm, even empty on the way back or forget climbing the valley hill above 80 km/hr. It gets feed only 91 octane non ethanol Premium. My 4100 pound Dodge Challenger with a measly 268 ft/lbs of torque rarely needs to go above 2500 rpm to climb the same valley hills. Mostly 87 octane 10% ethanol Regular. I wonder if my boss will let me put those graphics on the truck?

As much as the "ls-fanboys" try to claim otherwise maybe what the takeaway needs to be is that the truck 6.sl0 is OK if you use your truck as a grocery getter / people mover... much like a 3.8l gbody.

But if you want that same truck to have legitimate towing/haul butt performance, you need something else in it... just like that 3.8 gbody.

 

[olds307 and 403]

Getting rid of our Duramax just so my Boss could have a prettier truck was insane. Not insane miles for diesel, no DEF and no major issues. I carried big loads with it, it didn't need 4000 rpm to get up and go. It did run hot towing a big load, going fast but just needed the rad and intercooler washed out, gravel roads and bugs. It is the 380 ft/lbs number is why I don't give it a pass. When I first put my 403, even with 2.56 gears in my 88 CSC, it would spin both tires like hell, Powertrax No Slip and suck me back in my seat, once I added decent exhaust. It still blazed one tire with a terrible exhaust system. That is what 350 ft/lbs feels like. I don't get that feeling at all with this truck till 3500 rpm empty or 4000 rpm towing. It's not mine, so I can't unleash all the well hidden power GM left in this thing, it doesn't make the drive very exciting, unless the pedal is to the metal.