Thread: Weber Jetting Survey
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Old 07-22-2011, 04:51 PM
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Cobra Make, Engine: ERA 289 FIA #2100 Rio Red Wimbledon White Stripes 302 stroked to 331 Webers Richmond Road Race 5 speed
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My plugs looked good, light tan. But I was too lean above 3000 rpm AFR was 17. Went up 2 jet sizes to bring it down to 12.5. Reading plugs will get you close, but a dyno lets you zero in.

Take your distributor to some one with a Sun distributor machine to recurve your distributor. You want a total of 38* all in by 3000 rpm. That was a surprize too. Jim Inglese said to run 20* initial advance and 18* in the distributor for a total of 38*. Also keep the fuel pressure at 2.5 psi
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