spark plugs for 466 with 14 to 1 comp

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spark plugs for 466 with 14 to 1 comp

Post  57ford custom on May 24th 2017, 7:16 pm

Hi guys I am looking for a spark plug heat range for my 466 14 to 1 drag car. It has iron cobra jet heads and flat tappet cam and I am looking for an NGK plug heat range number. I use 110 octane in this and the plugs in it now are very old autolite's. I just got it running for this year and it seems to have a little miss so gotta start somewhere.
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Re: spark plugs for 466 with 14 to 1 comp

Post  rmcomprandy on May 25th 2017, 12:19 am

57ford custom wrote:Hi guys I am looking for a spark plug heat range for my 466 14 to 1 drag car. It has iron cobra jet heads and flat tappet cam and I am looking for an NGK plug heat range number. I use 110 octane in this and the plugs in it now are very old autolite's. I just got it running for this year and it seems to have a little miss so gotta start somewhere.

IF it is kept below 180 degrees, A 7 or 8 depending upon if it is driving or racing.

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heat range

Post  57ford custom on May 25th 2017, 11:40 am

which one is the coldest the A7 or A8
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Re: spark plugs for 466 with 14 to 1 comp

Post  gt350hr on May 25th 2017, 12:03 pm

The 8 is colder on NGK plugs. The colder the better with 14-1 on 110 octane.

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Re: spark plugs for 466 with 14 to 1 comp

Post  57ford custom on May 25th 2017, 8:14 pm

Thank you I will order a set tomorrow and start with number 8's
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Re: spark plugs for 466 with 14 to 1 comp

Post  460bronco on May 25th 2017, 9:07 pm

I'm guessing if his operating temp gets above 180 he would need an even colder heat range?
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Now where can I find a set of these

Post  57ford custom on May 26th 2017, 3:35 pm

My local Autozone is no help so far.
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