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spark plugs for 1986

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Old Dec 5, 2013 | 10:24 PM
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kprowler8's Avatar
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Default spark plugs for 1986
what is the correct number for AC Delco plugs in 1986 stock motor. I am finding different numbers on different sites and auto part stores. I have cast iron heads. what is best recommended. I normally order my parts from eckler's but the plugs that I pulled out of the car do not match any of there numbers. I just bought the car about 3 months ago.
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Old Dec 6, 2013 | 02:15 AM
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AC Delco R43TS is a 2 dollar plug that works great in my 85
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Old Dec 6, 2013 | 07:32 AM
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Originally Posted by kprowler8
what is the correct number for AC Delco plugs in 1986 stock motor...
Starting in 1986, the stock L98 engine came with aluminum (128) heads. Per the FSM and Owners Manual the correct replacement plugs you need are AC Delco FR3CLS, gapped at .035"

Dave
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Old Dec 6, 2013 | 08:10 AM
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Originally Posted by White87
Starting in 1986, the stock L98 engine came with aluminum (128) heads. Per the FSM and Owners Manual the correct replacement plugs you need are AC Delco FR3CLS, gapped at .035"

Dave
He has an early 86. Iron heads. FR3CLS is not correct .
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Old Dec 6, 2013 | 08:36 AM
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Originally Posted by JackDidley
He has an early 86. Iron heads. FR3CLS is not correct .
whoops! I just re-read the original post and you're absolutely right, the FR3CLS and not correct for iron heads...my mistake!

Time to call the optometrist!!
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Old Dec 6, 2013 | 09:59 AM
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I'm running AC-1 in my 85. I have a Pertronix coil and module and I run a .45 gap. Works good for me.
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Old Dec 6, 2013 | 10:29 AM
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NGK cast iron 86 corvette

V-Power UR5
2771
.035

G-Power UR5GP
3547
.035

Iridium IX UR5IX
7177
.035
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