I'm replacing the "067" cam in my 67 400 with the "068" factory spec cam. My car is a TH400 auto with A/C, power steering and power disc brakes. Will the "068" cam produce enough manifold vacuum to run all this stuff?
Generally the cylinders should all be within 10% of each other. The fact that cylinder #2 is low indicates a potential issue - rings, valve, cam lobe or just a bit of carbon. If the car runs fine and does blow smoke or burn a ton of oil, I wouldn't worry about it unless you are OCD. For what it is worth, my "low compression" motor read ~ 150 psi (when cold) if I remember correctly - whatever it was, it wasn't the 190-210 psi that I read about, so it confirmed (to me) that it was in fact a low compression motor out of a 68' Catalina (which for the record runs quite well given the age and unknown mileage).Yes, I was talking about cylinder pressure, see what you mean about calculating the comp. ratio, not only need heads off, but looks like somebody that knows what they are doing needs to do the measuring. All I know for sure is heads were milled .030 and it pings at 1000 ft. elevation or less. I was worried about [URL=https://www.gtoforum.com/usertag.php?do=list&action=hash&hash=2]#2 [/URL] cylinder because of lower pressure than the rest, till I happened across that bulletin, now not so much. Had already committed to "new" set of heads, but wont hurt to have an extra set, just in case....anyway thanks for all the info, later mav