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Using a PCV valve will lean you out... not likely 2000 ppm. I'd gap my plugs at .055 if you are using an MSD. Running a 195 thermostat will help and run Autolite 45 or hotter plugs. I'd even run platinums during the testing process.
If that fails I have a pair of 450 holleys ready to put on you can use for the test. They ran well under 350 ppm...
What is your intake vacuum at idle??? If it's 5-6 or lower (common on 8V 427's) your power valves are likely open at idle. 600 cfm holley's use 8's for which 11" of vacuum is needed to keep them closed. If you are at or within 3 inches (if you engine idles at 8" of vacuum you want to use a pair of #5 power valves.)
Hope this helps,
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
Last edited by SCOBRAC; 04-09-2005 at 01:19 PM..
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