What spark plugs

• Jun 26, 2018

• #1

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ike61

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I’m looking at getting a New set of plugs for my 383. It’s a 67 2 barrell motor but now has a 4 barrell, headers, stock electronic ignition, 516 heads with larger exhaust valves and mild porting. Stock dishes pistons, mild cam, and 2 and1/2 exhaust. Recommend me a plug brand and should I change the heat of the plug from the stock 2 barrell since I now have a 4 barrell? Thanks

 

• Jun 26, 2018

• #2

kiwigtx

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Autolite ATL-86

 

• Jun 26, 2018

• #3

Don Frelier

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I prefer champion RJ12YC or even better an Accel U-groove ( I think they call them C-cut today) but they are pricey. If you have a hotter coil you can gap them at .040"

 

• Jun 26, 2018

• #4

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rlem1977

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NGK XR4

 

• Jun 30, 2018

• #5

Houle #382

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I put NGK GR 4's in my 68 340. It will never see another champion plug as long as I own it. Big difference hated to buy Jap plugs but the way they ran in my race sled I had to try them. Won't look back