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Old 11-17-2018, 10:07 AM   #1
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1986 34.5' Airstream 345
Clamensane , PACA
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Smile Copper plugs

Hi everybody !

I would like to change the copper plugs on my 345 from 1985, i would like to take iridium one but there is three choice for that on rock auto, anyone know which one i have to take ?
Gap .044
Gap .040
Gap 0.045
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Old 11-17-2018, 10:35 AM   #2
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2006 28' Safari
1948 22' Liner
1989 34.5' Airstream 345
Jamul , California
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If you have the 454, the P30 chassis manual calls out a gap of .045 for part number R44t.

I would buy the correct cross referenced plug and gap to the specification as required. I would also check the gap on the new plugs if you buy the .045's, I don't trust them.

If i am wrong the group here will help me get it right, .
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Old 11-17-2018, 08:40 PM   #3
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1983 31' Airstream310
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IMHO You're just paying a lot more for a sparkplug that will give you no discernible improvement in combustion.

Cheers
Sidekick Tony
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Old 11-18-2018, 05:48 AM   #4
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1984 31' Airstream310
Honokaa , Hawaii
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Quote:
Originally Posted by Isuzusweet View Post
IMHO You're just paying a lot more for a sparkplug that will give you no discernible improvement in combustion.



Cheers

Sidekick Tony


I agree. I believe that the coach came with AC Delco plugs when new, thatís what I put i our 345 last summer.
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Old 11-19-2018, 04:24 AM   #5
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Oxford , Oxfordshire
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If you look on the side of he air intake, you should be able to see a sticker which sets out the stock set up.
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Old 12-09-2018, 07:54 AM   #6
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
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Hey,
Years ago, I tried all those different plugs. I never found any real change. I think those plugs are more for a race application. You know, where a 10th of a second means winning or losing a race. I don't know, it's ones own preference I guess. I may try those gapless ones again. I think Bosch made them. Maybe with today's fuels, they may be the way to go.
I put headers on my engine. Make sure if you do, or have headers, you get spark plug wires that are made for headers. I tried those boots that slip over the wires to protect them from heat. The one that was closet to the header burnt. I only put on 180 miles on the coach. I would have burnt a wire off, had we been able to go further.
Anyway, we re waiting on bearings for the engine. Everything else is ready to go. Total cost of rebuild should be about 1800.00 . Not to bad. Not going to be fun laying on my 60 year old back in 20 degree weather. But the dude abides. DJ
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