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sparks for riviera 1966 - wildcat 465 engine 425


cquisuila
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Google 'decoding ac delco spark plugs.'  You can find a chart that tells what each letter / digit stands for. i.e. T is for Tapered seats, L is for Long reach, R is for Resistor, the number (1-5) is the heat range.  (No T, no taper.) S is for extended reach. What does your chassis manual call for?

Edited by RivNut (see edit history)
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And I quote from the '63 (should be the same for all nailheads)

 

"Use the AC Type 44S spark plugs with 3/8" long terminal nuts for normal operation. For cars operating mainly at high speeds, the colder AC Type 42 Commercial spark plugs are recommended.  Where spark plug fouling is encountered at low plug mileage and where the car is used mainly for low speed city driving, the hotter AC type 45S spark plug may be used."

 

NO mention of a T  -tapered seat. 

 

But definitely I'd go with an R - resistor plug.   Tom T.'s experience far outweighs what was written 57 years ago so based on think about your driving situation and follow Tom's advice for either the R44S or R45S.  

 

Anyone. What is meant by 3/8" long terminal nuts ?

Edited by RivNut (see edit history)
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