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Registered
Join Date: Feb 2009
Posts: 1,006
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Here are some Bosch plugs to show different tip configuration. The ones I liked, the W4CS and XR2CS may not be available anymore. The 4’s in my 73S and the 2’s in our race engine. The X370 were probably 935 plugs, fridge cold. The 4’s were like the old 250’s the 2’s like 310’s. I have enough old plugs for my lifetime, but have switched to 9NGK’s in the race motor. Other than picking heat range for plugs I never experimented with plugs, never needed to.
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02-03-2025, 01:17 PM
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Registered
Join Date: Feb 2009
Posts: 1,006
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02-03-2025, 01:21 PM
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