Hey guys got a question about compression. I was screwing around w/ timing yesterday on my 400sbc when I noticed my dizzy hold down bolt hole was stripped. Today I helicoiled it and had to remove the dizzy in order to do so. In the process of getting everything back in order and getting the engine ready to fire...I was bringing the engine up on the compression stroke on the #1 cylinder when I didn't get any suction and Very little blowout if any at all in the plug hole with my finger covering the hole. I did get the engine to fire and run. I then proceeded to set the timing 12 initial and then 36 at 3000 Rpm. I havent checked the #1 after I started the engine. My question is why was there no blowout on my finger on the #1? I just checked it yesterday and I had a ton of suction and it really blew my finger outta the hole when I was looking for true TDC which I found. Anbody got any input?