Question on VT Spark plugs

[VTS5]

Been given two sets of new VT!! BOSCH Platinum Spark plugs.1 set of six HR9DPY,1 set of six HR7DPX.Whats the diff.?

[morry0]

one set could be hot burning for LPG conditions, one could be for supercharged, or V8 who knows? maybe best to take them to an autostore and identify them in a product manual

Been given two sets of new VT!! BOSCH Platinum Spark plugs.1 set HR9DPY,1 set HR7DPX.Whats the diff.?

[BlackVXGTS]

HR9DPY is the equivalent of the standard NGK BRP6EF-15 (heat range 9 with a 1.5mm gap). HR7DPX is a cooler running plug (heat range 7 with a 1.1mm gap).

[VTS5]

HR9DPY is the equivalent of the standard NGK BRP6EF-15 (heat range 9 with a 1.5mm gap). HR7DPX is a cooler running plug (heat range 7 with a 1.1mm gap).

Ok..Cheers