Timing Marks

[iam2fast4u86]

Can anyone tell me the proper way to allign timing marks on a 350 or 403 when Removing & installing a cam or timing chain?

[joe_padavano]

Originally Posted by iam2fast4u86

Can anyone tell me the proper way to allign timing marks on a 350 or 403 when Removing & installing a cam or timing chain?

Since the cam rotates at half the crank speed, either way is correct. Either both at 12:00 or crank at 12:00 and cam at 6:00. Of course, you still need to make sure the distributor is installed with No. 1 firing on the compression stroke, not the exhaust stroke.

[iam2fast4u86]

There are 2 timing marks on my crank sprocket. Is the correct timing mark the one to the left of the shear pin or to the right?

[88 coupe]

Originally Posted by iam2fast4u86

There are 2 timing marks on my crank sprocket ........

What manufacturer and part number?

Norm

[iam2fast4u86]

The crank sprocket that is in the 350 has 2 marks on it. It seems to be original because it still has the plastic like cam sprocket on it. 1 is to the left of the shear pin and the other is to the right. I am in the process of tearing the 403 timing cover off so I don't know if that is the same way or not. The new one I bought from coyles just has the 1 mark to the left of the shear pin so I guess I just answered my own question. Any advice on getting the crank sprocket off without damaging anything?

[88 coupe]

Regular gear puller.

Norm

[Danny Wiseley]

Originally Posted by iam2fast4u86

>snip< Any advice on getting the crank sprocket off without damaging anything?

On my '79 350, I had to pull the key out of the crankshaft before the sprocket would come off. Slot in sprocket doesn't go full width.
DW

[iam2fast4u86]

Got the timing chain in the 403 and timed it. Soon after that the lower end started knocking. I have shipped my 350 out to be machined and will be rebuilding it as soon as it gets back. Thank you for all of your help and I have learned that its always good to have a spare engine hanging around!