Hello all. I'm having issues getting this motor tuned up. 1971 340 small block with 360 cast iron heads. Heads have original style rocker arms with adjusting nut on top. I'm not sure what kind of cam is in the motor, but it has been changed. Motor has solid lifters. I lashed the valves cold at 24/26 after reading through some of these threads. I'm only getting about 110 psi compression on each cylinder, which I think is very low. The difference in compression between the cylinders is minimal. I have to increase the lash to an unreasonable amount to get about 130 psi compression (I'm talking like almost 1/16"). Vacuum is about 14 or 15 in Hg. Should I run the valves this loose to get better compression? Seems like it would beat everything up. Not sure if it's relevant, but timing is 19 degrees advanced. First time ever doing this *rookie*. Any help is appreciated.
