This is in the base of the distributor.. often responsible for miss-firing feeling when it starts failing .. you often think its a hard to find lead or plug problem..
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.. anyway.. this one fits all the GM 1974-86 Model V8 Carby Injected, Cross Fire, Carby versions.. all of them.. you can't get it wrong..
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Note it has 8 triangular pins in the casting. .not 6 as do a V6. This is for V8 only.