Skydog9

I want to check for timing chain slack. The largest socket I have is a 1 inch. I have the stock 350 motor. Can you tell me what size socket I'll need for the crank pulley?
And will I be able to turn it over with a breaker bar without pulling the plugs?

olds 307 and 403

You need a 1 1/8" socket.

Sugar Bear

Will not need to remove plugs, it will turn easily with a breaker bar. With good access one can often move the balancer back and forth by hand to check timing chain slack.

Good luck!!!

Skydog9

Thanks for the info.

Skydog9

Ok I've got a 1 1/8 deep socket with a 25 inch breaker bar. Sugar Bear you mentioned having good access. My motor is installed with nothing removed and I'm having a hell of a time getting onto the crank bolt. I got the socket on without being attached to the breaker bar, but with the socket on the bar, I'm not able to get onto the bolt.

Skydog9

I have not tried from underneath. But that won't work either for what I'm trying to do. I want to rotate the crank to TDC and check my rotor, and then rotate CCW until the rotor moves to check for timing chain slack. If I go from underneath I don't have someone on top to watch the rotor

Skydog9

Good idea

olds 307 and 403

I use my 1" Grey bar, 3" extension and socket. You will need a short extension to turn it from up top.

Sugar Bear

Can you grab the crank pulley by hand and rock it back and forth?

Skydog9

I can't budge it

Skydog9

No, it's an automatic