Hi all. I have a 1970 Camaro with a 350 250 HP motor in it. I would run
the AC 44 spark plugs in it. Now I find these plugs are no longer
available. Any body know a good replacement plug to use? Thanks for any
Have you tried the AC R44? That's just the resistor version of the same
plug. I know resistor plugs don't sound good, but in reality they usually
run just as good. You could also try Accell. I believe they still make an
equivalent version of the original non resistor plug. - Gary
An AC R43S is actually one step colder than a R44. The "S" just means the
electrode doesn't extend as far into the chamber as the standard plug. "S"
means short. The number is always the heat range with AC plugs. - Gary
I had to show this to the wife. She is amazed anyone thinks I'm polite. ;^)
Speaking of sparkplugs, I got an hour or so to flip through a NASCAR engine
builders guide and came across something interesting about spark plugs. The
funny part is the guy who runs the dyno I'm using now said the same thing I
read but his information is based on dyno runs at the shop. Say you buy a
set of R43S (or other applications) plugs for your street/strip car. Don't
bother regapping the plugs to a wider gap to make more power. It doesn't
make any more power than if you just check them for consistent gaps. I tried
it myself dropping from 0.045 to the 0.035 from the manufacturer and didn't
see any change at all. You'll pick up more power switching to a synthetic
oil (not much but it could change a 12.05 into a 11.99) than wasting your
time regapping your plugs.
I'll bet the big boys at the strip have other ideas but till I'm making over
1200 hp I don't think I'll have to worry about it. ;^)
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