I have searched several forums regarding the recommended spark plug gap for a 2003 Winnebago Chief 8.1L Workhorse engine. The recommendations range from .40 to .60, but I can find none that expressly reference NGK iridium plugs, TR55IX, #7164. NGK recommends these plugs with a .60 gap for the 8.1L Yukon 2500, but I'm wondering if that is the same 8.1L that is in the Winnebago Workhorse chassis and if the plugs and gap setting would be the same. Any info regarding the use of these plugs will be much appreciated.
TIA.
Mudcat64