Engine vibration
Engine 350 Chevy 1980, engine has vibration at all rpm. What are signs of crankshaft wear.

The 1981 Blazer featured an extermanl redesign. While it still had the same gas-guzzling engines that it had had since its inception, the front end of the SUV was restlyed to make the car more aerodyanimc.
Smooth hood, fenders, and bumpers gave the 1981 Blazer a very aerodynmic look for an SUV. However, it certainly did not look soft, especially when paired with the growl-like grilled, which featured 16 rectanglaur opening between square headlights.
The base engine remained a 250-ci I6 rated at 115 horsepower at 3600 rpm. OPtional engines included a 305-ci V8 rated at 130 horsepower @ 4000rpm, a 305-ci V8 rated at 160 horsepower at 4400 rpm, and a 350-ci V8 rated at 165 @ 3600 rpm.
Engine 350 Chevy 1980, engine has vibration at all rpm. What are signs of crankshaft wear.
1981 Chevy Blazer 4x4 clean runs good millage- 120,000 2 door power windows & locks
Any help appreciated.
Audio System
AM/FM radio
Convenience Features
Steering wheel: tilt-only
Seats
Front seat type: bucket · Upholstery: vinyl
Audio System
AM/FM radio
Convenience Features
Steering wheel: tilt-only
Seats
Front seat type: bucket · Upholstery: vinyl
Audio System
AM/FM radio
Convenience Features
Steering wheel: tilt-only
Seats
Front seat type: bucket · Upholstery: vinyl
Audio System
AM/FM radio
Convenience Features
Steering wheel: tilt-only
Seats
Front seat type: bucket · Upholstery: vinyl