As Tony says, BP7HS is a fine plug and it's NGK, which is good for me
because it's one of the few plug nomenclatures I understand. If they
look a little hot to you when you read them you can go half a heat
range colder to B7HC (hard to get, try a motorcycle shop) or if you
foul them try half a heat range hotter B6HC. You can also use the
Iridium or Platinum equivalent. I think the platinum is BP7HV.
The higher voltage your ignition is running enables you to run .050"
and you do want as wide a plug gap as your system can handle, so that
should be fine.
On Sep 24, 2007, at 12:22 AM, Tony Drews wrote:
> A bunch of the TRactor motor folks run the NGK BP7HS with good
> success. Normally gapped to something like 0.030" but may work OK at
> 0.050" as MSD suggests. I have similar compression (different cam,
> carbs, and ignition though) and they work well for me. We've used
> them with many different cams and several carbs - Strombergs, SU's
> and Webers.
>
> - Tony Drews
>
> At 02:59 PM 9/22/2007, James Gray wrote:
>> Can anyone suggest a good plug for my car ? I'm just short of 11:1
>> compresson, MSD 7AL-2 ignition, MSD HVC-2 coil
>> D spec cam & stock strombergs.
>> MSD suggests .050 gap for this set up & CR regardless of the plug
>> type.
>> Does this sound right ?
>> Thanks again,
>> Jim Gray
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