max RPM for a 75 chevy 350?

Question

odometer reads 56 thousand, but its rolled over once, what would be the max RPM in drive and going?

no special stuff, just a good breather.

Answer 1

The numbers above (4700 to 5000) are a good average redline for a low mileage 350. With 156k miles, it depends on how the previous owner drove it.
All engines develop a ridge at the top of the cylinder bores over time. Where the ridge actually is depends on what RPM the engine is run at on a regular basis, since a higher RPM stretches the connecting rods.
We're not talking inches here, but thousandth’s of inches (.001 .002, etc.) which is enough to bind the piston rings, so If the engine was never pushed to redline in the past, the ridge will be below the redline, and pushing it will bind the rings, causing the top ring to break.
If you don't know the engines history, don't push the engine to redline unless you're looking to rebuild it out of necessity.
With 156k miles, I’d keep the RPM as low as possible and drive it pretty easy. You have a good seasoned block, but that’s too many miles to be pushing it hard without a rebuild. No sense in risking a good block on worn bearings.
By the way, the Chevy 350 is a 60-degree small block, so it’s not a torquer as mentioned above. The S.B. Chevy is about horsepower, and you can kill the torque curve very easily. A big block, or 90-degree small block such as the 350 Olds is where you have torque to play with, but a lower RPM range.

Answer 2

350 eh? well those engines are all mostly all about their torque, which is found at around 3800 or so RPM. Anyway, the old 350's redlined around 4800 or so if they were wired for a pick-up truck, but had a 5000 RPM redline if wired for your camaros and what-nots. The difference maker is the fuel pump and the carburetor. After a certain RPM, the pump just can't deliver enough gas, and it runs too lean. Combined with the max performance allowed by your cams and distributor, too lean and delaying spark will do the trick and blow your engine. Oh, and a real high RPM wont suck enough fuel in through the carburetor because of the passage jets in there. The vacuum can only produce a certain PSI within the carburetor itself, and once it hits that max, it real hard to get it higher with them little jts in there. That's why you see so many fuel pump, camshaft, and carburetor upgrades for carbureted American engines.

Answer 3

350 eh? nicely those engines are all quite often all approximately their torque, that's got here upon at around 3800 or so RPM. besides, the previous 350's redlined around 4800 or so in the event that they have been under pressure for a %.-up truck, yet had a 5000 RPM redline if under pressure on your camaros and what-nots. the distinction maker is the gas pump and the carburetor. After a definite RPM, the pump purely can't grant adequate gas, and it runs too lean. blended with the max overall performance allowed by using your cams and distributor, too lean and delaying spark will do the trick and blow your engine. Oh, and a genuine severe RPM wont suck adequate gas in interior the path of the carburetor through passage jets in there. The vacuum can purely produce a definite PSI in the carburetor itself, and as quickly because it hits that max, it actual stressful to get it bigger with them little jts in there. this is why you spot such somewhat some gas pump, camshaft, and carburetor advancements for carbureted American engines.

Answer 4

small block 350 ive seen go up to 8800 rpm when bulit 4 raceing but stock about 4800 max before itll blow

Answer 5

In my 77 truck it usually shifts around 4,000 maybe 4,200 its been a while since ive had it there but i like to keep it under 3200 when cruzing down the interstate which as long as its under 70 its fine.. my .02

Answer 6

in general stock engines red line at about 5000 rpm.
diesels at about 2200 or less.