Fellas:
What is the normal range for compression on a 67 300 I6? I'm seeing the following:
Cyl1 100
Cyl2 120
Cyl3 120
Cyl4 110
Cyl5 110
Cyl6 110

Obviously, Cyl1 is a little lower, but is it too low? The thing still pulls like a champ, I'm just curious.

Thanks
stu...

 

I believe that if the higest and lowest readings are within 20% of each other compression is ok. IMO yours looks good.

 

Thanks Nitro. I'm new (again, I had a 69 stang with a 302 10+years ago) to big American iron. Been spending most of my time with little Japanese motors. Having this much torque again is FUN!