Harmonic Balancer Size for Chevy 350
The harmonic balancer size for a Chevy 350 is typically 6.750 inches in diameter. This size is commonly used for the 283, 327, and 350 small block engines.
Chevy took various factors into account when specifying harmonic dampers. Low-performance 327s tended to use the smaller 6.750-inch balancers, while the high-performance or Corvette motors used 8-inch balancers. However, nearly all 350s came with an 8-inch balancer due to their relatively long stroke.
It’s important to note that the harmonic balancer’s sole purpose is to absorb the vibrations generated by the engine, and its effectiveness diminishes over time, necessitating replacement.
If you have a stock ’74 350 with a stock bottom end, it’s likely to have a stock harmonic balancer with a 6.750-inch diameter.
Contents
- Are all small block Chevy harmonic balancers the same?
- What size is a 400 SBC harmonic balancer?
- How do you measure the diameter of a harmonic balancer?
- How do I choose a harmonic balancer?
- What size harmonic balancer for SBC 383?
- What size is a small block Chevy harmonic balancer?
- What size crank for a 383 stroker?
- How do you check diameter?
- Can you use a 305 harmonic balancer on a 350?
- Does size matter on a harmonic balancer?
Are all small block Chevy harmonic balancers the same?
You can use a balancer from any SBC except a 400, as long as the diameters are the same to clear your timing comb. Put your own TDC mark on if they’re not in the same spots.
What size is a 400 SBC harmonic balancer?
8″ Harmonic Balancer Chevy Small Block 400
| Attribute | Value |
|---|---|
| Diameter | 8-in. |
| Finish | Natural |
| Internally/Externally Balanced | External |
| Material | Nodular Iron |
How do you measure the diameter of a harmonic balancer?
Wrap a piece of masking tape around the hub. Measure the circumference (length of your masking tape) and divide that by 3.1416. The hub with the timing marks on it is what you want to measure.
How do I choose a harmonic balancer?
As a rule of thumb, the longer the stroke and greater the torque, the larger the diameter and mass. However, larger dampers can affect the acceleration and revving ability of an engine, so the right diameter and mass can help you strike the right balance.
What size harmonic balancer for SBC 383?
If your crate engine requires a 400ci harmonic balancer – this is the balancer for you! Fits many popular 383 Stroker crate engine configurations from BluePrint Engines and many others.
What size is a small block Chevy harmonic balancer?
JEGS Harmonic Balancer | Fits Small Block Chevy | 6.75” Diameter | Internal Balance | Exceeds OE Specifications.
What size crank for a 383 stroker?
The 383 small-block recipe is one almost every enthusiast knows: mix a 0.030-over 350 block with the 3.750-inch crankshaft from a 400 engine to deliver the long-strong combination.
How do you check diameter?
Diameter can be found by measuring the distance from one edge of a circle to the other edge, passing through the circle’s center point. The diameter can also be found by multiplying the circle’s radius by 2, or by dividing the circle’s circumference by pi.
Can you use a 305 harmonic balancer on a 350?
The bore stroke on a 305 is different than on a 350, so the torsional vibrations modes (and the frequencies and rpms that they resonate at) will be different than on the 350 tahn on a 305, so the damper design is different for each engine.
Does size matter on a harmonic balancer?
No matter what anybody tells you, size does matter when it comes to the harmonic balancer you use on an engine. Putting an incorrectly-sized balancer on an engine will do more than just cause it to not reach its full performance potential … it will cause serious damage to the rotating assembly.
