cquisuila Posted December 12, 2020 Share Posted December 12, 2020 Hello I want to CHANGE sparks on my car RIVIERA 1966 there are ON THE ENGINE SPARKS ACDELCO R44LTS AND I BOUGHT ACDELCO R43S But they are totally different !! see the picture please ! I don't understand can i put this ADELCO r43s Link to comment Share on other sites More sharing options...
telriv Posted December 13, 2020 Share Posted December 13, 2020 Yes, Delco R43S That is a plug more suited for highway use. I would use R44S OR R45S for mostly slow in town driving OR IF your only going on short trips. Link to comment Share on other sites More sharing options...
Barney Eaton Posted December 13, 2020 Share Posted December 13, 2020 I think the difference is one has a gasket and the other does not, it has the tapered seat/seal.......cannot interchange that difference. Link to comment Share on other sites More sharing options...
RivNut Posted December 13, 2020 Share Posted December 13, 2020 (edited) 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 December 13, 2020 by RivNut (see edit history) 1 Link to comment Share on other sites More sharing options...
cquisuila Posted December 13, 2020 Author Share Posted December 13, 2020 The length of filetage is different. The R43 has a very short thread compared to that currently R44 LTS put in the car it’s not serious ?? Can i put this new R43 ? I'm sorry to disturb you again. Link to comment Share on other sites More sharing options...
60FlatTop Posted December 13, 2020 Share Posted December 13, 2020 I prefer the 45 heat range. The 44 range has usually sooted up after a short time. I never tried putting a taper seat plug in a car designed for a gasket but they might be OK. Check to see if they seal, maybe a little soapy water. Link to comment Share on other sites More sharing options...
RivNut Posted December 13, 2020 Share Posted December 13, 2020 (edited) 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 December 13, 2020 by RivNut (see edit history) Link to comment Share on other sites More sharing options...
cquisuila Posted December 13, 2020 Author Share Posted December 13, 2020 OK R43 S is good with short thread I BOUGHT in France DENSO W16 PRU equivalent of R44S or R43S Thank you ! Link to comment Share on other sites More sharing options...
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