Hi guys, on a holley 1920 standard what size of main metering jet it´s correct? or what size is the best choice to power/economy for a daily driving? I have an aspen 225 standard A/T. I have main metering jet # 56, 58, 62 and 63. Thanks a lot!

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Aspen 79 Holley 1920 HEI
Aspen 80 Super Six

There's no single choice for the best jet; it depends on your particular car, carburetor, and operating altitude. Do you know how to read spark plugs to determine whether your engine is running rich, lean, or just right? Carburetor service information and links to Holley 1920 tuning threads are here.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Here in the Puget Sound region I can get my 1920 Holley Economaster version to run well with a #56 jet. I have modified the accelerator pump shot so it is very strong. It is very punchy with no bogs. Eric W has a standard 1920 and likes a #58. Both our cars are kind of heavy (over 3600 pounds) and we are near sea level with upgraded exhaust systems (2.25" pipe).

Dan asks some good questions, like altitude and what do the plugs look like with your ignition system? Is it stock?

Click on the red link below my name to see how my plugs are running with a stock 74 ECU (electronic ignition).

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Thanks for yours tips. Greeting from Chile!

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Aspen 79 Holley 1920 HEI
Aspen 80 Super Six