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75plyduster
 Post subject: Spark Plugs?
PostPosted: Wed Feb 13, 2008 5:45 pm 
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Joined: Mon Jan 21, 2008 8:04 am
Posts: 315
Location: Spring, Texas
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Which ones should I use? I heard the NGKs are good, but which one exactly? Its on a 1975.

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SlantSixDan
 Post subject:
PostPosted: Wed Feb 13, 2008 6:06 pm 
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Location: North America
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I like NGK spark plugs a lot. The '75-up cars take a different type of spark plug than the '74 and earlier cars. Stock plug for your '75 is a # UR4. You can try going a step colder with today's cleaner-burning gasoline, to gain some ping-resistance (UR5). If you want to spend money on ultrapremium spark plugs that'll last a very long time and allow the use of a wider plug gap for better idling and driveability, it'll be a UR4IX or UR5IX. I'd recommend buying the regular plugs for now, until you figure out which heat range works best for your setup.

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Aggressive Ted
 Post subject:
PostPosted: Wed Feb 13, 2008 6:18 pm 
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Supercharged
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Location: Black Diamond, WA
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I run UR4's in my 1978 head and they are very,very nice! They are the best plugs I have ever used. :D

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74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG


Last edited by Aggressive Ted on Wed Feb 13, 2008 6:32 pm, edited 1 time in total.

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thomasj6604
 Post subject:
PostPosted: Wed Feb 13, 2008 6:20 pm 
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Joined: Wed Apr 04, 2007 3:46 pm
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Location: Minnesota
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I'm using UR4 in my stock 1979 D-100 225 and they're working well.
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75plyduster
 Post subject:
PostPosted: Wed Feb 13, 2008 6:23 pm 
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Joined: Mon Jan 21, 2008 8:04 am
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Location: Spring, Texas
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Ive read on other posts about the ngk plugs but it was on a '74, will the plug wires mentioned for a '74 work on a '75?

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DusterIdiot
 Post subject: Yep..
PostPosted: Wed Feb 13, 2008 6:32 pm 
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Location: Salem, OR
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will the plug wires mentioned for a '74 work on a '75?
That's affirm...

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