31 LaSalle Posted March 20, 2023 Share Posted March 20, 2023 I have a1928 Chrysler 72 it is presently fitted with champion C4 spark plugs which need replacing I have managed to get a set of champion C5 spark plugs would these be compatible with my car Thank you Link to comment Share on other sites More sharing options...
lozrocks Posted March 21, 2023 Share Posted March 21, 2023 I'm a believer in taking advantage of modern technology where possible. Spark plug adapters are available to reduce the size of the thread down to 14mm. Then you have a huge range of available heat ranges and technologies to choose from. 1 Link to comment Share on other sites More sharing options...
31 LaSalle Posted March 21, 2023 Author Share Posted March 21, 2023 2 hours ago, lozrocks said: I'm a believer in taking advantage of modern technology where possible. Spark plug adapters are available to reduce the size of the thread down to 14mm. Then you have a huge range of available heat ranges and technologies to choose from. I am not a big fan of modern technologies that's why I have vintage cars which can be worked on with normal tools. not like modern cars with all the electronics just my own view Link to comment Share on other sites More sharing options...
Narve N Posted March 21, 2023 Share Posted March 21, 2023 I advocate for the evaluation of different plugs and finding optimum plug reach. This S65 engine was run with standard Model A Ford Autolite #3076 plugs (1/2" reach?) before I switched to the slightly longer reach (3/4"??) of these Champions (forgot the #, probably also made mainly for Model A and thus easily obtainable). As visualized, the Champion plugs brought the spark more into the combustion chamber. The car then ran 3 mph faster up my test hill after the changeover, but that might be also related to all fresh plugs. 1 Link to comment Share on other sites More sharing options...
viv w Posted March 21, 2023 Share Posted March 21, 2023 Both my model 62 and my model G70 motors came with Champion C5 plugs that were fitted way back in the 60's. I will eventually run them with those plugs. The C4 are used on Model A Fords and will be a slightly different heat range, try them and see how the car performs. 1 Link to comment Share on other sites More sharing options...
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