Reply to "holley jetting"

bosswrenchMember

AS I mentioned before, with many unleaded fuels, the plugs don't color up as the used to, or you get weird colors (try interpreting brick red!). A Holley 6619, a 4160 type 600 vacuum-secondary carb quite popular on Panteras in the '70s & '80s, runs a 64 main jet and a 73 secondary drilling with a 6.5 power valve. I passed CA smog with this carb for years on my 351C and it always ran lean at idle but richened nicely above 2000 rpms according to the air-fuel machine. Note that not all Holley jet numbers correspond to SAE drill sizes- a #66 is 0.066" but a #68 is 0.069".

8/3/048:56 PM

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