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autolite 26? or 405?

4K views 3 replies 3 participants last post by  302 Z28 
#1 ·
hey im having issues with my plugs, my builder said try autolite 26s and i think someone from here said autolite 405? it just kinda seemed like the 405s???what, dont really bite alot of thread??like maybe 4 5 turns ( finger ) then its snug? is that about right? the 26s dont even thread at all! the heads are 290s BBC the 26s look like a hot plug while the 405s are deffinitly longer thanks, mike
 
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