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#371
02-21-2016, 05:14 PM
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Re: Gramma's Car: the new project!
What # are you running now?
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#373
02-21-2016, 08:26 PM
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Re: Gramma's Car: the new project!
UR55 is the next coldest and the only one available with the wide gap. If you're willing to run an .035" gap plug you can go to a UR6.
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#375
02-21-2016, 11:33 PM
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Re: Gramma's Car: the new project!
The reasoning behind the big gaps "back in the day" was to create a bigger flame kernel to try to light off the ultra-lean mixtures they employed back then to get them past the smog sniffer.
I've never had a problem running .035" gaps with an HEI, that's what I'm running with my 357 small block in the Malibu wagon. I don't think you'll have any issues if you're willing to give it a try. FWIW.
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#376
02-21-2016, 11:55 PM
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Re: Gramma's Car: the new project!
Oh, if that's the case, I do have an extra set of the .040 gapped NGK UR4 and UR4GP which is the factory heat range for the '72 455HO engines. But that might be too hot of a heat range I imagine?
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#378
02-22-2016, 02:08 AM
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Re: Gramma's Car: the new project!
With NGK plugs, the higher the number the colder the heat range, i.e. 4 = hot, 5 = middle, 6 = cold.
I *believe* ranges 4,5 and 6 are the standard passenger car heat ranges for NGK's, you might have to upgrade to a premium or race plug to go colder. FWIW, I was running UR5 plugs in my 496 and they were too hot. I've since switched to 6's which I am still currently evaluating.
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#379
02-26-2016, 03:49 AM
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Re: Gramma's Car: the new project!
Just got my copy of Hemming's! Congrats, man!
__________________
My cars, passed down by my grandfather: '68 Camaro SS (454/TH400, possible L78/M22) LeMans Blue, black deluxe interior, black vinyl top. 3.73- mostly Day 2. '89 Mustang GT- 3.55, subframe connectors, muffler delete, and a couple other minor mods. Exactly as he wanted it, so how it shall stay Also: 1995 Ford F-150 XL 2004 Dodge Ram Hemi GTX- #192 of 433 Ain't no fun in viewing your car as an 'investment'. Get out there and beat on it!
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#380
02-26-2016, 11:24 AM
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Re: Gramma's Car: the new project!
Thank you! I just got my extra copies that I purchased, from Hemmings. My subscription copy hasn't showed up yet!
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