Question about Cars & Trucks
Dear god. none of you sound like you know what your doing.
The Bosch HR 78 NX spark plug is a super 4 plug that has 4 outer ground electrodes and uses surface air gap technology.
There is no need to mess about gapping the plugs as they are Factory pre-gapped electrodes.
So don't mess about gapping your super 4 Bosch, Just fit them.
Posted on May 11, 2013
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Posted on Jan 02, 2017
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