LQ4 Power

[Fast355]

Towing 8500lbs behind a full size van and getting 13mpg while running 2800rpm @ 65mph? I find that hard to believe. A "cheap" 350 built for towing that can make over 425ft-lbs of torque at 3k rpm and over 460 ft-lbs of torque at 4.5k rpm? I find that ridiculously hard to believe.

I put down 370 RWHP on a Mustang dyno through a 4L80E and GM 9.5" 14-bolt. I put down 340 RWTQ at only 3,000 rpm with a locked converter and peaked about 370 RWTQ at 4,500 rpm. At only 2,400 rpm it was already putting down 330 RWTQ. A 355 TPI engine with production vortecs and a 210/220 cam put down 490 ft/lbs at peak and over 400 from 2,600 and beyond.

As for the MPG, thats what it gets towing on flat land with no winds and I have pulled down 18+ running empty Do not run EGR either.

Its a stock 1-ton GM crate 350 shortblock
Edelbrock Etec 170cc heads
271/276 @.006, 215/220 @ .050, .534/.547" lift, 114* LSA Comp cam installed at 110* ICL. Crane Gold 1.6:1 SA roller rockers
Ported L31 Marine intake with an 85mm LS1 TB and 85mm maf into a stock Express airbox
0411 PCM running HP Tuners MAF Enhanced operating system
Doug Thorley Tri-y headers into 3" Thorley headpipes, reduced to 2.75" mandrel bent piping into 2.5" Thunderbolt cats and a dual in/single out Walker Dynomax bus muffler with a 3" mandrel bent tail pipe
454 radiator with factory oil cooler, duramax fan on a trailblazer ss fan clutch, Napa 200a AD-244 alternator, Racetronix fuel pump hotwire, March 4490 Underdrive pulleys. Runs a 4L80E with a B82 factory high stall converter and a 3.73 geared 9.5" 14-bolt out of a 6-lug 2500 Express.