Cool site. Ok there was a discussion about what a stock 305 could make power level wise. Here is the claim. This person is claiming running the stock heads, with the stock size valves, combustion chamber, etc., without the porting/polishing that the 305 can make 575hp That's also with the stock lift cam, with the stock crank, stock pistons, stock intake and carb." Is this even at all possible. Now don't you guys take this the wrong way, as I'm not trying to stir up trouble just asking a question about claims that I had a hard time swallowing. Thanks guys.

 

With a tricked out induction combo and a ton of compression, that claim would still be seriously doubtful. The only way that is even remotely possible is with a supercharger or a turbo, or a gang of nitrous, which would stick the crank right through the oil pan in no time.

 

Is it a R I C E, because you know every sticker on there adds like 10-15 horsepower. And the cool blue wires and stuff add like 30 hp.LOL!!!! THis dude is full of SH*T. A stock 350 will not even put out that much power. Not even a vortec. Come on, vette's do not even have that much power off the lot.

 

Extol,

Welcome to ThirdGen.org!

Since your original discussion didn't mention anything about the lack of a power adder, with stock heads, velaves, etccetera, it would be possible to make 575HP from a 350. The trick would be to use a truck 305 with dished pistons and larger chambers (many of which were made), beef up the rockers and valve springs (not valves) and add about 12-15 PSI of supercharged boost and lots of nitromethane and timing. You might make 575HP at the crankshaft (brake horsepower) with a stock bottom end - for a little while.

It sounds like complete BS on the surface, but I bet it could be done. It wouldn't be very reliable, and certainly not very street-friendly, but it might make that kind of power on a dyno for a short time.

Be careful about those "stories". There is usually a catch. We have a member (ODB) who was running unbelievably good times with a 305 in an 'F' car, and many people outrightly called him a liar. No one ever asked, and he never volunteered the fact that the car was lightened by over 1,000 pounds from the stock configuration. He was asked if it was a street car, and since he drives it on the street, the answer was, of course, "Yes". No one ever asked if the body was stock - they just assumed.

If that same 305 was running naturally aspirated and on pump gasoline and in basically stock form, I seriously doubt that it would consistently make anything over 210 HP at the rear wheels, or about 250-260 at the crank.

 

In a nutshell..Hell no.

 

Get the latest Popular Hot Rod magazine and read the article on the Engine Masters Challenge finals. Granted, that was a 366 cid limit, and they were going for best average torque + HP between 2000-6500 RPMs. The engines made between 550 and 600 peak HP, IIRC.

The cost to build these engines (to duplicate, anyway) ranged from $6000 to $20,000. In every case, the 12 finalists did head/porting work, and in a couple of cases, that was the majority of their work. None of them used typical production heads (although one did use Vette heads). None of them used a factory production cam (surprise, surprise).

If an unported, stock valve, stock cam, normally-aspired 305 can make 575 HP, then these guys, who had 10 months to get ready for the dyno pulls, sure did waste a lot of their time and money.

 

Thanks for the input guys.

The thing is the person in question is talking about this without power adders to. I know with money anything can be made to go, but the claims here are just plain ludicrous.

 

The day a stock 305 can make 575 HP I will take 10 of them.

 

I am going to call . The only way this would be possible is with a 400 hp shot of nitrous. If only the head gaskets would survive the insane cylinder pressure, NOT.

 

Stock? No blower? No nitro? No way.

Unless, of course, he has a big phat stack of those "15 HP" Neuspeed decals in the car, and a couple chains of those "80 HP" phart cans on the exhaust tips...

I still bet you could get almost 600 at the crank before she went to pieces on the dyno with the right blower (through a carb). Chevy 302s could make 600+ HP with a blower and survive to race again, so the longer-stroke 305 might have a crack at 575 for a minute or two.

 

I did see an article where a 305 made 425 (I think 400 something) horsepower N/A. But that was with 1 3/4" headers, heavily ported Vortecs, huge cam, etc. etc. etc. This guy is full of it.