73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: TandocTools on December 05, 2010, 05:22:26 PM
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My Chilton's lists the factory plug gap for my 75 GMC C15 with a 350/4 barrel and H.E.I. at .060--Can this be right? I just got some iridium NGKs that were gapped for my application from the factory at .035. Why so different from GM's specs? I know how to gap iridium plugs so that's not a problem, but that's a bigger gap than I have ever seen on a stock vehicle and just wanted to double check before I install them!
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I use .045, never used .060, seems to big a gap for stock ignition. I would only use .060, with an Msd or like aftermarket ignition.
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There were two specs depending on the plugs used. One was .035" the other was .060" do you know the engine code? Y or V? What plugs are you running?
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quite a bit of newer cars/trucks are .060 I wouldnt think you would have a problem unless you have a lot of blowby or something. those NGK's are good plugs. I would go .045 but thats me...
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The plugs were NGK YR5IX but I'm not sure what code I have. On the build sheet and on the glove box sticker the only code I see associated with my engine is "7F LS9 350CU V8 4BBL". Am I not looking in the right place?
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This is the distributor I am running
http://cgi.ebay.com/ebaymotors/SBC-BBC-CHEVY-CLEAR-CAP-65K-HEI-DISTRIBUTOR-6500-CL-/350400947621?pt=Motors_Car_Truck_Parts_Accessories&hash=item51958625a5#ht_9719wt_958
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watch out for problems with that clear cap, I have seen people have trouble with them arcing
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Will do. I'm just using it to "scrape by" until I can afford a D.U.I.!
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.035" on that plug
I've had a clear cap on my 85 K20 since I put the engine in... Haven't changed it yet and that was Feb 2008
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So I should leave it at .035 or open it up to the GM spec of .060 or something in between? What motor is my Chilton's referencing as .060 if not the 4bbl 350 with H.E.I.?
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.035"
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My Camaro has a DUI HEI ignition with a clear cap on it.
Reading this post made me realize that cap is about 10 years old now.
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Now I am compelled to try both! I'll report my results!
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the engine code vile was talking about is the vin number engine code it’s the 8th one in from the left to right
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When I went to get my tags the clerk said my VIN was weird--the eight digit from the left in my VIN is an 0.
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Lol sorry missed its a 75 its only the 3rd letter
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My plug gaps were spec'ed at .045". I haven't tried to change them to any more or less. and I haven't looked anywhere else for specs.