AC Delco Rapidfire
#1
AC Delco Rapidfire
Hi Folks, Just an interesting note. while waiting to hear from the insurance company about fix my ride I decided to do a few things. One of which was change the standard plugs to the #5 rapid fire. The increase in mpg is outstasnding. before the change my average mileage was 25.6 and after it was 28.8. thats just the plugs I ordered the new wires and cap but they haven't come yet. I wonder what they will do. Just thought this was interesting, Cheers, George(blueshark)[sm=yikesomg.gif][sm=bounceybounce.gif][sm=americanasmiley.gif]
#4
RE: AC Delco Rapidfire
When I took the old ones out they still loked good. I almost didn't change them. I couldn't believe the dif. I got the car from my cousin and he was pretty **** about maintenance. he really took great care of it. change the oil every 3 months even when it sat in the winter months. I've never seen a change like that from changing the plugs. the old ones were AC Delco 41-629 standars. I wonder if they were for iron heads instead of alum.
#5
RE: AC Delco Rapidfire
there is a noticable difference between iron head plugs and aluminum head plugs ( length of thread and the washer ) are dead give aways. If you changed them yourself you would notice the difference . I tryed to get a set for my 86 and the guy tryed to sell me the #1s no listing for my aluminum heads ,,,, good to know the #5s fit ty for the info
#9
RE: AC Delco Rapidfire
Interesting insight on the AC plugs. But a question on the gas mileage: I live in Maryland, which is faily hilly. Not sure if that is the main cause, but my around town mileage is only 13.8! 92 stock LT1 with auto. I took one trip and the highway figures (at around 65 mph average) was a little less than 22 mpg. Do these figures seem about normal? Car is in good tune and I am not an aggressive driver(well, most of the time, he-he).
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