350 hp out of a fairly stock 340

350 hp out of a fairly stock 340

Wow... that was agonizing. That video should've been 30 minutes shorter, and the narrator's hyper-enunciation is irritating. That was the first of his videos I've seen.
*Marks YouTube's "Do not recommend this channel" icon*

"We got 100HP more out of a 340 than the factory. All we did was upsize the valves, add 1.7 points of compression, and install a hotter cam. Please ignore the fact that the original number was through the full OE 2-inch exhaust system and mufflers while running all the accessories, while ours was gross HP with open pipes and not even running a water pump."

wawarnick said
Hot rod got 320 HP out of a dead stock 340, and 352 HP replacing the manifolds with headers.

"On factory claims of 275 horsepower at 5,500 rpm and 340 lb-ft (3,200 rpm), we got 320 horsepower at 5,500 rpm and 368 lb-ft at 3,500 rpm. So it's clear Mopar understated the facts by 45 horsepower and 28 lb-ft."

One of those Peterson rags did a stock 340 rebuild back in the 1980s or maybe very early '90s. They got similar results with a 3-angle valve job on stock ports and using factory rockers (same-ratio rollers don't add HP anyhow). The only real difference was boring it +.030", and they got 318 horsepower.

lemondana said
What's wrong with these people-Have to put a damn Edelbrock on where a Thermoquad belongs..

I wonder the same thing all the time, although in the case of content creators it's usually due to "promotional consideration" (free or deeply-discounted product).
Because of that consideration, it's imperative that the OE carb lose to the freebie: "We'll use a Lean Burn carb!" The one in the video was definitely not a Competition Series, which has a dramatically different airhorn casting. It was stock emissions-era stuff, possibly from a Ford or 13-Letter Sh!tspreader (International Harvester) application, or a later 9000-series "stock replacement" carb. The forward-facing machined pad on the airhorn casting's a dead giveaway.