compression
Cargo Master
Joined: Jul 2003
Posts: 2,720
Likes: 20
From: Four Oaks, NC
I don't know what the specifications are for a 360 of that particular year. I figured somewhere around 8.5:1 to 9:1 would be about right, that was just a guess.
Of course compression itself causes heat, and the hotter the air the more pressure, so there is more variables to it.
A Chiltons or Haynes manual, or the Ford service manual, should have the exact specification for what the cranking pressure should be for that engine.
Of course compression itself causes heat, and the hotter the air the more pressure, so there is more variables to it.
A Chiltons or Haynes manual, or the Ford service manual, should have the exact specification for what the cranking pressure should be for that engine.
Junior User
Joined: Aug 2005
Posts: 63
Likes: 0
From: Grand Rapids
My used engine purchase that had a recent "rebuild and would drop in and run great" had 6 of 8 cylinders in the 110 to 120 range with two at a weak 90 psi. Weak as in it took a couple of extra strokes to stabilize at 90. The previous owner seemd to think even this engine ran good. Tear down found a chunk of carbon stuck on an exhaust seat in the #1 cylinder and a broken compression ring in the #8 cylinder. So I would think anything under 100 or close to 90 or less would be suspect. My 360 I had in high school "79" had a burnt valve which would only get 40psi but the other 7 cylinders were all in the 110psi area. I put a lot of miles on that 7 cylinder engine, even drove it cross country. The truck I'm restoring know had two cracked valves and made it from Maryland to Michigan on the remainig 6 cylinders, and still had plenty of power.
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