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Old 11-22-2012, 08:11 AM
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numbers

ok, my head numbers are as follows
8991492
J143
GM53

so I assume that J143 = Oct 14, 1973 ?????
tapered plug?
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Old 11-22-2012, 11:42 PM
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spark plugs and gap

Nothing like making sure of what you have. Didn't take you long at all to figure it out. Like I said just watch the extended tip R45TS if you have dome pistons. If you like Autolite get the Autolite 146. NGK-YR5.
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Old 11-24-2012, 09:39 AM
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Does anyone know what kind of washers to use on spark plugs to h

Does anyone know what kind of washers to use on spark plugs to have the plug slightly favoring the exhaust valve. Can I use regular washers or lock washers???
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Old 11-25-2012, 11:00 PM
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Spark plugs and gap

No, there are indexing kits you purchase that has different size shims. Here is an article on indexing your spark plugs. http://www.hubgarage.com/mygarage/su...ng/blogs/10030
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Old 11-26-2012, 04:55 AM
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thanks

Thanks for the replies. So the Autolite 146 looks like its no existant now. So I dont have dome pistons since my cr is only 9:1, this is a street car not a track car. There are autolite 26's in there but there was a big elgin cam in the motor that I took out.

So what is a solid recomendation for a plug for me? Is there a shortie plug that will work to give me more header room? Thanks Jason
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Old 11-28-2012, 10:00 PM
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spark plugs and gap

Jason, call NGK tech line, the phone number is in post #7. Tell them you want the V Power UR4 in a short plug. According to their website a 1971 Chevrolet Camaro uses a UR4 plug. Their short plugs is suppose to be about the same as Accel shorty plugs.
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Old 12-01-2012, 07:33 AM
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The only "shorty" plug for 75-79 Camaro with a 350 that I have been able to find is an Accel #0276S-4 on Summit

I have checked the NGK c/ref chart, and it's not there.
0276 (without the "S") crosses to a UR5 (one heat range colder than UR4)

I've copied the relevant pages and attempted to highlight the info from the NGK catalog. See attachment
Attached Files
File Type: pdf NGK Pages.pdf (1.88 MB, 45 views)
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Old 12-01-2012, 03:16 PM
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I think that shorty plug is for angle plug heads, with headers.
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