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The 48 manual calls for .040 plug gap. My 48 has a 52 216 rebuilt in it and calls for .035 gap. It has J8C Champions in it. What gap should I use?
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
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Either will work fine - I set mine at the .035"
Gene Schneider
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Either will work fine - I set mine at the .035" I always had set mine at 0.035 as called for. Kept hearing about 0.040 so I tried it. There was a noticeable difference, Especially at idle.
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I agree. .040 seems to be a lot better. I've set mine at both.
Jon T.
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For the 1937-1940 .040" was the recommended setting. If they were set closer you could get a surging at mid speeds.
The little M-8 plugs used fro 1941-1948 were also set at .040"
For 1949 and up .035" was recomended.
Two reasons I would use the recomend .035".....
As the gaps widen from use you are closer to .035" and in a long run factory knows best for a reason.
Gene Schneider
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The 48 manual calls for .040 plug gap. My 48 has a 52 216 rebuilt in it and calls for .035 gap. It has J8C Champions in it. What gap should I use? Do you prefer the Champions over the AC plugs ?
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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The Champions are the plug that were in it when I bought it.
They looked great with no carbon build up at all. #6 had a minute white carbon around the outside edge. Don't have any idea how many miles are on the plugs.
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Shade Tree Mechanic
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Shop manual says .040, then .040 it should be.
Last edited by TeeZee; 05/24/15 12:23 PM.
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1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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Shade Tree Mechanic
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bobg, Your link takes you to the tune up specs beginning in 1949. In 1949, the spark plug gap is .035. Here is the link from the 42 - 47 shop manual where it states in the second sentence that the plug gap is .040: http://chevy.oldcarmanualproject.com/shop/1942_47/4247csm1229.htm
Skinnin' my knuckles on a daily basis.
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The engine in my 48 is a 52. That is where my original question came from.
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Joined: Nov 2009
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Shade Tree Mechanic
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Skinnin' my knuckles on a daily basis.
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