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454XL or just 454

slauder

Regular Contributor
how to tell? i have 454's

how to tell? i have 454's from 1991 sitting in my 3100 open tiara. its rochester carb-ed.
 
"The 454 XL has an electronic

"The 454 XL has an electronic module mounted on the side of the exhaust riser, contains knock module, relay and circuit breakers housed in black plastic cover."
 
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