350 tbi hp and torque They all need all of the parts replaced to feel like a real v8. New cam, springs n seals, rocker arms and intake manifold with 50mm tbi unit. 4L throttle body it would get to almost 300 wheel horsepower. Re: The 300HP TBI 350 challenge 02-04-03 07:08 PM - Post# 168240 In response to GTO_Ryan I'm with Mike on the "Gee Whiz" factor of TPI setups, they do look pretty cool and have decent torque, but with simple mods to a TBI, you can get 240 HP. That engine makes 285-320 HP @ 4,600-5,000 rpm depending on the heads and 365-370 ft/lbs of torque @ 3,200. The G-20 van produced 285 foot-pounds of torque. Foot is barely in Read the tech article on Late-Model TBI Trucks Power Upgrades, brought to you by the experts at Chevy High Performance Magazine. Port heads, cam swap, Hone, rings, bearings. A 350 with 4 barrel and headers is perfect. L31 350 255 hp, 330 lb/ft TBI 350 210 hp 300 lb/ft peace Hog . pcrznowevfwiamduavspgrnjyazuwzneevmqfaycrjkqnswkbbgousdndmhhgftzpeyyrdurpgp