I think that you will find that .035 may be okay for the 437's... I am trying to think back... I may have gapped mine to .030....
Generally speaking , the A4 runs cool... the plug is just a little bit hotter than the Champion 12... somewhere, they are listed as being in the same heat range... I can tell you from experience that they perform very well and last. Once you get the engine hot and have run it under load, pull the plugs and look at them... If you system is fine from the electronic stand point, you will find th eplugs lookng almost like new. I hav enever had a foul 437
David
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