Well, I went out and bought a set of autolites #24 for my 351w. However, when I took out my old plugs I noticed that they had different thread lengths and what not. They don't look very correct to me, I've posted a pic of the two. I do have Trick Flow alluminum heads, but I wouldn't think that would mean that they would be any different than stock plugs. I drew a couple lines to show how long the threaded sections are.
The plug on the left is a Bosch (with the numbers 4417, R3 966)
The right one is an Autolite (#24)
I have been running the engine w/o any problems with the Boschs since 99 so which one is wrong? Any help would be appretiated!!
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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