426 Hemi

[rlgiv]

A few days ago I was watching an episode of American Muscle Car and the topic was wich of the old engines where the strongest. They took about five or six of the most popular engines from the 60-70s and completely rebuilt them to stock configurations. They could only be bored .060 and all of the timing hardware was from parts that where factory spec. The 409 by Pontiac was the first they hooked up to the Dyno and it put out 406 HP. This was the only engine that even came close to it's factory stated horsepower. Most of the other big blocks they tested where in the 600 hp range with stated values of 425. The 426 hemi with a stated hp from the factory of 425 hp produced an outstanding 880 hp. It blew everything else away. I think the closest was the 427 that was put into the Corvettes. If anybody is interested I will rewatch it and post all of the engines that where tested. I was just amazed.

[sniper226]

I think this was discussed before here. Probably in the OT forum.
Someone actually posted all the ratings of the motors tested as well. Was an interesting show.

[RoostKing]

Not sure what they did, but someone was smoking crack.

No way the Hemi, or any of the other motors would put out that kind of power, if stock. Stock meaning stock jetting in the stock carbs, stock wires blah blah.

RoostKing...

[Cuda340]

Originally Posted by RoostKing

Not sure what they did, but someone was smoking crack.

No way the Hemi, or any of the other motors would put out that kind of power, if stock. Stock meaning stock jetting in the stock carbs, stock wires blah blah.

RoostKing...

I agree. The SRT engineers have stated that the 6.1 Hemi puts out the same power as the 426 street Hemi. This bears out in comparable quarter mile times and dyno tests. (The 6.1 SRT Chargers are consistently recording 385 rear wheel hp).

[rlgiv]

Maybe that is why AMC had such inflated numbers. The tests they did where simply engines hooked to the dyno. Not even running threw a transmission if i remember corectly.

[BGuerity]

It is not that difficult today to get upwards of 600hp on yesterdays 425hp engines. The reciprocating asemblies are lighter, the cams are better, the engines seal-up better, and the flow work available for cylinder heads and intake manifolds are better. And this does not require Nitrous!

[rlgiv]

Thanks.... and welcome to the board.

[RoostKing]

Originally Posted by BGuerity

It is not that difficult today to get upwards of 600hp on yesterdays 425hp engines. The reciprocating asemblies are lighter, the cams are better, the engines seal-up better, and the flow work available for cylinder heads and intake manifolds are better. And this does not require Nitrous!

The difference between 600 HP and 880 HP, as the show stated they got out of the hemi, are HUGE. Plus these were supposed to be stock(and i take that too mean in the original configuration they came from the factory, in say 1970)

RoostKing...

[340EBody]

The show's parameters were:

No "ringers".
Sixty thousandths max overbore.
Stock heads & intake.
Compression ratios were stated.
Carbs had to be the same "type" as originally installed.
Camshafts could be no better than "blueprint" specs.

With that being said, there's a lot of room for improvement here. Ported heads and manifolds. Camshaft actully installed is anyone's guess. There's no telling what was done to the carbs, jetting, ect. Crankshaft was attached to the engine dyno. Not sure about accessories.

The horsepower numbers were:

1962 Chevy 409 made 406hp.
1963 Pontiac 421 Superduty managed 423hp I believe.
The '65 Ford 427 touched 637hp.
The late 60's Chevy 427 ended up right at 500hp, give or take 5.
The 1966 Hemi made 820hp.

Their line was that these engines represented what you might have found in a "highly tuned street machine" during the 60's. They didn't specify just how much "tuning" each engine had.

[RoostKing]

I dont care how big of cam you have, if you cant flow the air/fuel, and with stock manifolds and head, your not going to get to 820hp. IMO

I could be wrong I suppose, i just dont see it happening. Were they running alcohol LOL

RoostKing..