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sparkplug read

Posted: 8/19/06 10:32amMessage 1 of 6

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Redwingvette

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Waterford, MI - USA

Joined: 9/13/2002

Posts: 1795

Vette(s): 1973 Red coupe

Since it is still raining here I decided to keep the car in the garge and check the sparkplugs out. These plugs have about 10,000miles on them since I rebuilt the motor and put on the Performer heads. Anyway, They are for the most part light tan with dark deposits around the thread area and about half way up the part that goes up to the electrode. Since I was going to change them should I stay with the same heat range? The car runs great but maybe a little rich.Redwingvette38948.440474537

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans

Borgeson Steering box

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sparkplug read

Posted: 8/19/06 3:35pmMessage 2 of 6

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Adams' Apple

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Duncanville, TX - USA

Joined: 11/8/2003

Posts: 22720

Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

They sound normal to me, Brian. As long as there are no wet deposits, or completely black, they sound like 10,000 mile plugs. Can you post a pic of a couple of them?

If the engine is runnin a wee bit rich, I would do something with the carb before changing the heat range on the plugs.

Joel Adams
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sparkplug read

Posted: 8/20/06 12:51pmMessage 3 of 6

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cthulhu

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Hot Springs, AR - USA

Joined: 4/24/2004

Posts: 3236

Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

[QUOTE=Redwingvette]Since it is still raining here I decided to keep the car in the garge and check the sparkplugs out. These plugs have about 10,000miles on them since I rebuilt the motor and put on the Performer heads. Anyway, They are for the most part light tan with dark deposits around the thread area and about half way up the part that goes up to the electrode. Since I was going to change them should I stay with the same heat range? The car runs great but maybe a little rich.[/QUOTE]

i agree they sound fine... but a pic would help

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sparkplug read

Posted: 8/20/06 1:12pmMessage 4 of 6

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Redwingvette

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Waterford, MI - USA

Joined: 9/13/2002

Posts: 1795

Vette(s): 1973 Red coupe

Thanks I will try to get some pics up when I get a chance to look at all of them. I just pulled out 4 for the inspection, easiest ones to get to. Once I pul them all I will have a better chance to get pics.

Dewitt radiator and dual electric fans

Borgeson Steering box