I just bought some spark plugs for my 1985 Chevy Truck and got online to double check that they were the right ones on AC Delco's website. They gave me R43TS and the website said that they were correct for a
305 "F"series engine, but I have a 305 "H" series which is supposed to get R45TS. Will these still work? They seem to be different in the length they penetrate into the engine. Can anyone help me in the difference in the engines and/or plugs? Thanks!!- posted
17 years ago