wanting to know is the timimg mark is on 0 and the number 1 piston is up does this mean that it is on compression stroke or can it be 180 off thanks pup

When the piston moves toward the head it is compresston

Or 180 off..... It's a four cycle engine, so it comes up on compression and exhaust; down on power and intake. Remove the #1 spark plug and you can feel it come up on compression. The timing mark lines up on both compression and exhaust.

when the timing mark is on t.d.c. and the number 1 piston is at the top does that mean that it is on compression stroke or can it be 180 degrees off try again thanks pup this is a 327

thanks JunkYardDog
the pup

You should thank RichardJ instead. I was just quoting his answer to your question that he posted this morning. Since you asked the same question again I assumed that you didn't read his post. Didn't want you to miss his answer.

Good luck with your project.

It doesn't matter what engine it is (as long as it's a four stroke). The piston moves down to suck in air/gas, then up for compression, then down on power, and back up on exhaust. That's two turns of the crankshaft (pulley or flywheel depending on where the timing mark is), so it is up on compression or 180 off on exhaust when the mark lines up. I've tried as good as I can here....