krazykuda said

You must check your parts first...

Check your true compression like this:

http://www.forabodiesonly.com/mopar/showthread.php?t=278215


I hav a thread where I was doing the same thing, but found out that the 67 273 heads come in at 63 cc not 57 cc like the books say... Not as much of a compression boost as I had wanted, but in the right direction....

http://www.forabodiesonly.com/mopar/showthread.php?t=322035

Click to expand...