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The original AC plug (R44) has been discontinued for my 327/340. Recommendations on a replacement if originality is NOT an issue?
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Re: C2 Sparkplug
The OEM plug was AC44 (no resistor), but is really too cold for the street. The slightly hotter AC45 is more resistant to fouling, but will not overheat in normal street and highway driving. AC no longer makes non-resistor plugs, so if you want an equivalent to the AC45 and are willing to use non-AC plugs, I recmommend the NGK B4 or Denso W14-U.
Duke -
Re: C2 Sparkplug
Duke Thanks I'll give it a shot. By the way I followed your reccomendation a couple weeks ago (C2 Overheating/Timing Problem), and replaced the vacuum advance with a NAPA something, and readjusted the static timing. What a difference! Still hesitates a little on take off in low gear but once it hits 1200, its like a rocket.Comment
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Re: C2 Sparkplug
There have been some reports that guys are having a tough time finding/ordering the NGK B4s. If the price is the same try to order the Denso W14-U. These have Denso's "u-groove" design that features a u-groove on the ground electrode. Since sparks propagate easiest from sharp corners these plugs might have slighly lower breakdown voltage. NGK has a similar feature with their V-Power plugs that feature a v-groove on the center electrode, but the B4 is a plain type that does not have this feature.
Both NGK and Denso have a more corrosion resistant shell plating than conventional AC plugs, and FWIW the double platinum electrode plugs used on all C5s are Denso, not AC.
It might be easier to order locate/order these plugs by stock number.
NGK B4: stock number 3210 (10 per box)
Denso W14-U: stock number 6008 (don't have a parts count on 6008, but it's probably 10.
Retail price for these plugs should be in the range of about $2 each.
DukeComment
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Re: C2 Sparkplug
Try the hotter R45 AC plug, only the installer will know the difference.Comment
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