Autolite 25 Plugs VS Autolite AR25

JerryWMember

Hello there, Any input on running Autolite 25 Plugs VS Autolite AR25? This is a 11:1 compression engine, and my 25s are fouled black. Any input is appreciated...

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14 hours ago

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joules"Racing is Life, anything before or after is just waiting" - Steve McQueen

The AR is the racing version with same heat range designation as the regular Autolite 25, but has a back-cut center electrode and a nickel plated body.

Your problem appears to be too rich a mixture and I’d recommend you look at tuning the carb first using a wide band O2 sensor.

11 hours ago

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