What size main bearing journal is on a 350 Chevy?
The 350 Chevy engine, a staple in the automotive world, is known for its reliability and performance. Whether you're a car enthusiast or a mechanic, knowing the specifications of this engine is crucial for maintenance and repairs. One of the key components to understand is the size of the main bearing journal, which plays a significant role in the engine's overall function.
What is a Main Bearing Journal?
The main bearing journal is a critical part of the engine's crankshaft assembly. It provides a surface for the main bearings to support the crankshaft, allowing it to rotate smoothly. The size of the main bearing journal affects the engine's performance, oil flow, and overall durability.
Main Bearing Journal Size for the 350 Chevy
The standard main bearing journal size for a 350 Chevy engine is 2.45 inches (or 62.23 mm). This measurement is essential for anyone looking to replace or upgrade the bearings, as using the correct size ensures proper fit and function.
Why is the Main Bearing Journal Size Important?
Understanding the main bearing journal size is vital for several reasons:
- Engine Performance: The correct size ensures optimal oil flow and lubrication, which is crucial for engine performance.
- Durability: Properly sized bearings reduce wear and tear on the crankshaft, extending the engine's lifespan.
- Compatibility: When replacing bearings, knowing the journal size helps in selecting the right parts, preventing costly mistakes.
Conclusion
In summary, the main bearing journal size for a 350 Chevy engine is 2.45 inches. This specification is essential for anyone involved in the maintenance or repair of this popular engine. By ensuring you have the correct size, you can help maintain the performance and longevity of your vehicle.
Frequently Asked Questions
What is the diameter of the main journal on a SBC 400 crankshaft?
I've noticed that you can buy a SBC block say a 400 block but with the smaller 2.450" (350) mains instead of the regular 2.650" mains that are standard on the SBC 400. You can even buy a 4.000" stroke crank with the smaller 2.450" mains.
What size is a Chevy 350?
The 350 cu in (5.7 L), with a 3.48 in (88.39 mm) stroke, first appeared as a high-performance L-48 option for the 1967 Camaro. The exact displacement is 349.85 cu in (5,733 cc).
What is the bore size of the 350 Chevy main housing?
I've read that the main bearing bore size (without bearings) for a chevy 350 is 2.6410. I've measured a std main bearing at . 097 thickness.
What is the clearance of the main journal on a SBC?
The commonly accepted rule that most crankshaft manufacturers prefer for street and performance engines is 0.0010-inch for every 1-inch of journal diameter. So for a 2.45-inch small-block main journal, the bearing clearance would be 0.0024-inch.
What size is the main journal on a 350 Chevy?
Introduced in 1967, the 350 pioneered larger 2.45-inch main journals and 2.10-inch rod journals, beefier 3/8-inch rod bolts, four-bolt main-bearing caps (for selected applications), and a reinforced cylinder block.
What is the standard clearance for journal bearings?
1-mil clearance per inch of shaft journal diameter is a general rule of thumb. So if your shaft journal is about 6" to 10" in diameter, then 7-mils COULD be about right. Some considerations include shaft speed, bearing liner material, lubrication, service conditions, and environment.
What size balancer is on a 350 Chevy?
8-inch balancer
Nearly all 350s came with an 8-inch balancer because of their relatively long stroke. An 8-inch balancer was used on the short-stroke, 3.0-inch-stroke, 302 Z/28 engines because those mills were intended for road racing.
How do you measure the diameter of a crankshaft journal?
So I want to make sure that I avoid that I'm going to make a measurement. I'll record the value and then I'll make a measurement on the opposite. Side.
Are all 350 harmonic balancers the same?
In most cases the 305 used a wide hollow balancer about 6 inches tall, 350`s came with the solid 6 inch balancer or solid 8 inch balancer. All small block chevy generation 1 balancers are interchangeable anyways except the 400 small block and the vortec engines of 1996 and later.
What is the main bearing clearance on a 350?
Let's take the traditional 350 small-block as an example. The factory specs include 2.450-inch main bearing journals and 2.100-inch rod journals, which means the target bearing clearance should be about 0.0024-inch (0.0025 is the common spec) on main bearings and 0.0021-inch on the rod bearings.
