1975 Argosy MH 454 proper spark plug gap?

[cejohnsonjr]

Hello all! I have a 1975 Argosy motor home on the p30 chassis with a 454 engine. Does anyone know the proper spark plug gap? The AC Delco plugs I bought came in at 0.056". TIA for the help.

[swebster]

My 454 in our 86 345 specifies .045". The specs are on the air cleaner label. Any Arg owners out there know if the gaps are the same?

[scottanlily]

Hello ,

the plug gap should indeed be .045 gap ,You may have been sold the wrong plugs . Have your parts guy double check the part # to be sure ,the heat range needs to be right , wrong plug ,wrong heat range too.That gap is an unusual size ,sometimes .060 gap is shown as correct.Pickup a haynes (brand) repair manual very good book ,check the specifications as listed for a 454 truck heavy duty service or p30 chassis.

Scott