Good baseline on jets for Holley 500

ssm31
Pit Crew

Posts: 18

Good baseline on jets for Holley 500 Dec 27, 2012 11:47:50 GMT -6

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Post by ssm31 on Dec 27, 2012 11:47:50 GMT -6

Ian running a southern sportmods and had to rebuild the holley 500 and it had 78 jets and the power valve plugged. It ran extremely rich and fouled the plugs. I installed a 4.5 power valve and 74 jets but still seems a little rich. I know until I get some laps for good plug readings it'll be hard to know how close I am. What are some of you guys running jet wise for this class. The altitude where I live is @ 3600 fas.

boz Pit Crew Posts: 3	Good baseline on jets for Holley 500 Dec 30, 2012 13:25:42 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by boz on Dec 30, 2012 13:25:42 GMT -6 I run 74 in my northern sport mod

lizardracing Fourth Place Posts: 70	Good baseline on jets for Holley 500 Dec 30, 2012 13:57:37 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by lizardracing on Dec 30, 2012 13:57:37 GMT -6 Stock is 72 according to Holley so I'd start with 72-74. Your jets numbers will get smaller with gains in altitude. Less air, less fuel needed.

flipflop Pit Crew Posts: 17	Good baseline on jets for Holley 500 Feb 1, 2013 19:52:04 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by flipflop on Feb 1, 2013 19:52:04 GMT -6 Takes a bit more fire power but 83-86 with a blockoff works if your not stingy with your timing.

Good baseline on jets for Holley 500

Post by ssm31 on Dec 27, 2012 11:47:50 GMT -6

Post by boz on Dec 30, 2012 13:25:42 GMT -6

Post by lizardracing on Dec 30, 2012 13:57:37 GMT -6

Post by flipflop on Feb 1, 2013 19:52:04 GMT -6