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#1
05-16-2017, 01:34 PM
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NGK plug recommendation for iron heads
I am in the process of doing a top end swap on my 400 with flat tops and enlarged valve 1968 #15 heads. I am currently using AC Delco R43S plugs. I have heard good things about NGK. Do yall think it is worth the swap and if so, which NGK plug should I use?
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1970 GTO: Atoll Blue, TH400, 400 +.060, small chamber Ferrea big valve fitted # 15 heads, Summit 2802 cam, Iron intake, Cliff Ruffles 850 cfm qjet, Hooker headers, 2.5 mandrel bent exhaust, Race Pro mufflers, 3.73 Safe-T-Track. |
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#2
05-16-2017, 01:42 PM
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The 43s are a good heat range for your motor so if there in good shape save your bucks for other things.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
05-16-2017, 02:14 PM
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They are. Only 2700 miles on them. Perhaps I should leave well enough alone, but we know that can be hard to do lol.
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1970 GTO: Atoll Blue, TH400, 400 +.060, small chamber Ferrea big valve fitted # 15 heads, Summit 2802 cam, Iron intake, Cliff Ruffles 850 cfm qjet, Hooker headers, 2.5 mandrel bent exhaust, Race Pro mufflers, 3.73 Safe-T-Track. |
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#4
05-16-2017, 02:39 PM
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Right Steve. They are not big bucks, but I would not replace the AC's until you are just ready to replace them anyhow. I have XR5 (3332) installed but I dont think they have much selection for a cooler heat range.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. |
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#5
05-18-2017, 09:13 AM
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I have NGK XR-4's in the GTO and XR-5's in the Grand Prix. Since going to them I won't use anything else in my Pontiac engines.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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