what spark plug?

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Apr 18, 2017 | 01:37 PM

rochhound

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what spark plug?

i have a 86 c4 with about 20.000 miles on the motor. one of my plugs has fouled so im going to replace them,also plug wires.
the plugs in the motor were ac delco r43ts im looking for a plug that doesnt go through the roof in cost but will do the job my motor is stock.

thanks steve

Apr 18, 2017 | 04:53 PM

Cjunkie

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From: Ashland, OH

NGK UR4, stock #6630

Last edited by Cjunkie; Apr 18, 2017 at 04:56 PM.

Apr 18, 2017 | 05:37 PM

Joe C

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edit: I am in error. NGK 6630's are for iron head SBC - Cjunkie is correct -

Quote:

Originally Posted by Cjunkie

NGK UR4, stock #6630

from what the OP has presently in his engine, delco r43ts, indicates an iron head L98. NGK UR4 6630's if i'm not mistaken, are for aluminum head cars. my 2-cents - NGK 3547 #UR5GP plugs, about 2.20 each...

http://www.rockauto.com/en/moreinfo....041219&jsn=564

Last edited by Joe C; Apr 19, 2017 at 05:54 AM.

Apr 18, 2017 | 06:55 PM

Tod Stiles

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From: Arlington VA

I have AC Delco in there right now but have used NGK on many, many cars. I don't know what they do at NGK but they really seem to make superior spark plugs.

Apr 18, 2017 | 09:04 PM

Cjunkie

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From: Ashland, OH

Quote:

Originally Posted by Joe C

from what the OP has presently in his engine, delco r43ts, indicates an iron head L98. NGK UR4 6630's if i'm not mistaken, are for aluminum head cars. my 2-cents - NGK 3547 #UR5GP plugs, about 2.20 each...

http://www.rockauto.com/en/moreinfo....041219&jsn=564

The plug I listed is for an IRON head L98. Your information is mistaken.

Last edited by Cjunkie; Apr 18, 2017 at 09:05 PM.