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You can get close with the body off if you undo the spring and set the cat at what you think will be the ride height.
Just use a tape measure and set the wheels straight ahead and straight up and down. Not ideal for driving but good enough for test drives and driving to get it aligned.
For the Engine there are number cast into the block above the bell housing and some stamped into a pad on the passenger side front part of which should match the VIN of the body. You can decode the stamped number to learn more about the car.
For the cast in number googl for chevy block casting numbers, there is a site around that tells you lots about what the block is.
I'd do it with the body on and everything installed. Some auto manufacturers even specify putting weights in the seats when doing an alignment so the car is sitting in as close to its driving condition as possible.
...I'm wondering if I need to have the body on the chassis to do the alignment on the rear wheels...
how can I know what year is my motor??...
You could probably set the toe without the body, but that's only half the story. You would need the weight of the body to get the camber to the point where you could get the car to an alignment shop.
Jot down the numbers on the engine pad at the front of the right head.
the numbers of the motor are 152101455 T0830070
can some one tell me the year of the motor I know that it's not the one that came with the car. thaks for your help
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