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Old 04-06-2008, 01:47 PM
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How much hp/rpms can my 454 handle?

I have a 454 truck engine with a stock bottom end except for forged pistons. It is a 1975 2 bolt block. How much rpms can it handle and how much hp? I would like to try nitrous some day with it.
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Old 04-06-2008, 03:47 PM
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Forged or cast crank?

Shane
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Old 04-06-2008, 04:20 PM
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I am not sure but I am assuming cast. What did they put in the 2wd trucks in 75? What would the numbers be with cast and also with forged? What would be the difference in what they can handle?
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Old 04-06-2008, 04:42 PM
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The better question is what do you want to do with the engine? A safe limit for an otherwise stock engine would be in the 5000-5500 rpm range. Decide what you want to do with the engine, choose a reasonable horsepower and torque goal and build it accordingly. The RPM capability of the engine will end up where it needs to be if you build it according to what you need it to do. Don't worry about how many RPM the engine can turn, for most people they don't matter unless you're building an all out race engine.
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Old 04-06-2008, 05:01 PM
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I built a 73 2-bolt 454 with the stock cast crank that made 450+ and occasionally saw 6000 rpms. The HP level was well within limits, but I agree; keep your HP peak (cam choice) at a level that doesn't constantly require more than about 5500 rpms to get your power.

I'm quite certain it would be a cast crank. Almost all GM cranks are cast from the factory with a few exceptions, especially from the 70s and later. A cast crank will have a thin casting line where the molds came together. A forged crank will have a wide parting line. Another way to tell (although not as definitive depending on the alloy) is a cast crank will "sing" if you hit it with a plastic mallet. A forged crank just "thunks." Of course the crank has to be out to do that test.
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Old 04-06-2008, 09:21 PM
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Thanks, I will keep it below 5500. I am currently making a little over 400 hp.
Can I use nitrous without hurting things? Also when do you hit the nitrous? I figured it was around 3000 or so.
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Old 04-07-2008, 06:15 AM
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"How to hotrod big block chevy engines" by HPbooks says that two bolt main blocks can handle about 600 HP in stock trim, that doesn't mean your crank or rods can, but the block should take it, I would stick below a 150 shot on the NO2, You will need to do a lot of research to be able to use nitrous on a BBC without melting everything so do your homework, but as for your previous question, regardless of RPM you hit the Nitrous at wide open throttle.
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Old 04-07-2008, 01:48 PM
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Even if it has a cast crank it is good till 6500 rpm with ARP rod bolts.BBC engine parts are more heavy duty than the SBC parts.Now it depends on what heads you have to see if it makes a difference in revving it that much or not.
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Old 04-07-2008, 06:24 PM
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Quote:
Originally Posted by curtis73
Another way to tell (although not as definitive depending on the alloy) is a cast crank will "sing" if you hit it with a plastic mallet. A forged crank just "thunks." Of course the crank has to be out to do that test.

Is it not the other way around for the ring and thunk test?
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Old 04-10-2008, 04:02 AM
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Edelbrock #2904 Vic Jr holley 4781 850cfm carb Crane #134261 F-326-2 cam
Ported stock heads, stock valves stock compression ratio NOS big shot nitrous. Easy 800hp. needs 110+ race gas.
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Old 04-10-2008, 04:05 AM
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Edelbrock #2904 Vic Jr holley 4781 850cfm carb Crane #134261 F-326-2 cam
Ported stock heads, stock valves stock compression ratio NOS big shot nitrous. Easy 800hp. ok on premimum pump gas up to 225hp needs 110+ race gas for beyond 225hp.

Had a motor same a this with just trw forged flat tops. Took everything I could throw at it.
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Old 04-10-2008, 07:58 AM
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Wow, I suppose if you keep preignition and detonation from happening it can take a lot huh? Would not having the rotating assembly balanced reduce the levels it can handle?
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Old 04-10-2008, 09:01 AM
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Quote:
Originally Posted by chevyv8_power
Wow, I suppose if you keep preignition and detonation from happening it can take a lot huh? Would not having the rotating assembly balanced reduce the levels it can handle?
If the crank balance is off by that much, you're going to get accelerated wear reguardless of the NOS shot.
The imbalance is very hard on the bearings.

The highest I ever twisted mine was around 6700-6800 for a brief second or so while on the NOS. Traction was always and issue at the big power levels.
A BBC is a pretty strong motor. You are right though as long the the combustion is keep normal the bottom end and block can take a lot of NOS power. Unless you know that you're doing thou (tuning), a mistake is real hard on the motor with big shots. Detonation and mechanical shock and heat is much more severe on the components (while injecting NOS) when things are not right. Things get $$$melted and broken$$$ in a split second.
When you're tuneup is right, It's smooth sailing. Just hang on tight and make sure you got the thing pointed where you want to go whenyou nail it.
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Old 04-30-2008, 07:15 PM
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are you saying you ran 800hp on a stock bottem end? what rods..3/8 or 7/16?
any more info on this combo?
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Old 05-01-2008, 04:58 AM
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I have a 396 built by a race shop with stock steel crank and stock rods W/ 3/8" ARP bolts dont know how much hp it makes but I have bounced it off of the 8k chip a few times and I'm sure it wont be the last. A good balance job goes a long way.
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