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Old(s) Fart
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Are 4, 6, and 8 cylinder in-cap coils the same (HEI)? Yes, some 4 and 6 cyls had in-cap coil......

Maybe the better question is, can i interchange them?
The answer is, it depends. Chevy HEIs use a different P/N coil than do Olds and Buick. The Buick V6 HEI uses the same coil as the Olds and Buick V8s, for example. The Chevy 60 deg V6 apparently did use the same coil as the Chevy V8.
 
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