Power limit on a 350

[Rustbucket350]

I'm interested to hear if there even is a limitation on a 4" bore block. I've heard it's 700 horsepower from old posts. More importantly I'm wondering at what point will factory internals truly fail?

When does the block give up?

Is it RPM? Is it horsepower? Or is it torque that will kill it? If it is rpm then what rpm. With factory rods and factory crank. I'll balance it. Looking to maximize some junk. As in can a guy rev a factory forged crank and regular rods to 10 grand? Probably not. Although I'm still going to try.

I'm probably gonna throw something together and prove any answer wrong but I am interested I'm the opinions.

I know. Why would you want to rev it to 10 grand? Well, to make more power.

 

[TAZZ 1]

With factory Crank Rods and Bolts can be safe at around 370 -400 hp now when you start talking about 10000 RPM you can throw all that factory stuff out the window. I have seen very few 350 make power at 10 grand, high RPM is a killer of factory motor parts. But good luck.

 

[biker]

There is a Canadian guy in my Province who just made 700 plus on a 355 with a single turbo, stock block, rods, hyper pistons and cast crank. He made several dyno pulls. Same engine made 435 n/a if I recall. He builds and tests some cool stuff without a monster budget.

Here is the vid:

 

[Ratty_81]

Ole Piss Cutter Pat! Watch his vids a lot, always good info. I don't think he meant to push that motor to 700hp, though!

 

[TAZZ 1]

Guy said looking to maximize some junk. Dyno world for YouTube and real world with motor in a car that you actually drive is two different things. Don't get me wrong, not that those motors can't be built. But can you really make it a good street motor. How long do you think it will last. Just trying to keep it real. I have a split block setting in my shop that was killed on a dyno .

 

[biker]

Guy said looking to maximize some junk. Dyno world for YouTube and real world with motor in a car that you actually drive is two different things. Don't get me wrong, not that those motors can't be built. But can you really make it a good street motor. How long do you think it will last. Just trying to keep it real. I have a split block setting in my shop that was killed on a dyno .

No problem, just wanted to give an example of a number that a guy hit with cast stock parts, which is about as relevant as you can get to the junk that most of us have available to play with. If a stock block and rotating assembly can handle 700 plus for a few pulls, I doubt any of us throwing the kitchen sink of junk parts at a stock assembly is going to hurt it without doing something extremely stupid. (Which I have done).

A real world example is a 355 I put together 30 years ago without really knowing much more than assembly basics. Solid lifter cam, 4 bolt block, forged crank and pistons, 780 Holley, double hump heads, dual point distributor. It went 7500 rpm full throttle shifts every day in the summer for 10 years.

 

[G72Zed]

NOS + SUN Tach = 10,000 RPM.

 

[Chevyforever]

Bill Grumpy Jenkins and some of the other pioneers of Pro Stock drag racing pushed some factory components to some fairly high rpm levels back in the early days of the class. Factory blocks, cranks heavily massaged "turbo" heads turning in close to 9000 rpm, IIRC. Short stroke engines usually 331 ci.

 

[krabben1]

 

[TheReelEss]

You can have exactly as much power as you can pay for.