Engine rebuild choices

ArizonaKid said

I didn't realize there was that much involved in choosing a cam, right now the car is a stock 225 slant six, i'm not sure of the gear ratio because the tag is gone, :oops: and I don't remember what it was when i re-did the seal. The transmission is a stock A-904 automatic, nothing has been changed on that. if i needed to, i would be willing to change the converter, especially because the motor would already be out. my tire size would be 215/70/14's all around.

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Jack the rear of the car up and support it with stands. Take a piece of chalk and mark the rear of the drive shaft. Mark one of the backing plates and mark the drum in line with your mark on the backing plate. Put the car in neutral. Have a friend hold the un marked wheel still. Turn the drive shaft one complete revolution from where you marked it. Note how many times the wheel turned that you marked. If the wheel turns 3.5 times to the drive shaft's one, you have a 3.55. If it turns a little more than 3 times, you have a 3.21 or a 3.23. Get the picture? Oh and if by chance you have a limited slip, your friend will not need to hold the other side. You will know because if he's holding it while you try to turn the drive shaft, you will not be able to turn it until he turns the tire loose.