lean mixture on hard run

[William F.]

Took my '67 L79 out and did a few full throttle short time period runs up through 2nd and 3rd. Close to 5 grand power dropped off and was one or 2 "pops. Went back home and discovered an extremely low secondary float level. I corrected this ( have a Holley 3367 rather than 3810) went back out and it pulled strong, no smoke (wasn't any smoke before, either) or miss. Any chance I did burn a piston, etc., or is all probably well?
Thanks

[Bill I.]

Re: lean mixture on hard run

Bill, you're fine. Don't sweat it for that short period of time. Bill

[William F.]

Re: lean mixture on hard run

How can I tell for sure ,short of borscope, teardown,etc. Is a good steady vacuum a good indicator that all is well?
Thanks

[Timothy B.]

Re: lean mixture on hard run

William,

The L-79 should idle at approx 750 RPM/14" vacuum. Strong vacuum is always a good indicator of internal engine condition. I think you are fine..

I think a lean condition would be reflected in the spark plug and if detonation from lean the plug will not be clean. Is the fuel pump pressure OK and have you leaned the primary jets without enlarging the PVCR .

The sq in" of the jet area needs to be maintained for WOT conditions.