[RAIV-Z]

Originally Posted by charlie66

When you say AFR was lean , what was it? Whats your timing at 30 psi?

Let me clarify the lean comment. It was lean at idle after starting it up after sitting for about a week.


AFR during a run was 11.9 to 12.2
Timing at 30lb was peak 27 degrees

[charlie66]

27* is a lot of timing for 30psi . Didnt they move the plug over to in front of the exhaust valve an give this head a heart shaped chamber? Thats a real efficient chamber . I have the new Edelbrock head with all that done to it and @30psi it only wants 18*. Something to try would be taking some timing out and richening it up a bit more . What are the egt's at 30 psi with 27*?

Originally Posted by RAIV-Z

Let me clarify the lean comment. It was lean at idle after starting it up after sitting for about a week.


AFR during a run was 11.9 to 12.2
Timing at 30lb was peak 27 degrees

[RAIV-Z]

Originally Posted by charlie66

27* is a lot of timing for 30psi . Didnt they move the plug over to in front of the exhaust valve an give this head a heart shaped chamber? Thats a real efficient chamber . I have the new Edelbrock head with all that done to it and @30psi it only wants 18*. Something to try would be taking some timing out and richening it up a bit more . What are the egt's at 30 psi with 27*?

The chambers are heart shaped. No EGTs yet. When we get it back together, we'll pull a bunch of timing out and then ramp in back in slowly again.