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02-18-2005, 06:23 PM
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#1 |
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Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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another question
The manual says that R-44 sparkplugs are right for the 350 but I got a set of R-43's in the motor and i was just wondering could these R-43 plug's just be the same as the R-44 but the name just changed or do I need to buy new R-44 plugs?????? cause these plugs look like there in ok shape. Any help is appriciated
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1985 Chevrolet C-30 454 1-TON Dooley 1969 CHEVROLET CST-10 PICK-UP Good memories 1999 Chevrolet Z71 Ext. cab 5.7L Good Memories With a quart of oil, and a gallon of gas, she won't let no other car pass!!!.  &  FOREVER
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02-18-2005, 06:40 PM
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#2 |
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my gas saver
Join Date: Sep 2003
Location: Clarksville, TN
Posts: 2,046
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i think mine were r 45`s when i replaced them a few months back, they`re probably pretty much the same.
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85' SWB, 4.3/TH350, getting ready for paint 84`SWB, 462ci./TH400, cowl hood, 15" billet spec., flows, blazer buckets/console, flat black 71`SWB, project ebay feedback |
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02-18-2005, 07:13 PM
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#3 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Yeah most of the auto parts places show the r43 as a replacement for the r44. I'm running them w/ no problems just a cooler plug I beleive.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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02-18-2005, 07:16 PM
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#4 |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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The numbers refer to "Heat range". This is the amount of heat that is relased to the cooling system, through the heads. It has to do with the amout of contact between the insulator and the metal housing I think.
The colder plugs can reduce detonation in higher performance engines as long as they don't become fouled by being too cold. Hotter plugs are generally used in older engines that are consuming some oil. This allows them to burn the residue off, so they don't foul. |
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02-18-2005, 07:20 PM
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#5 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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You shouldn't have any problem running 43's, they just run cooler than 44's like Jim said. I've got 45's in mine but I'm gonna put R44 plugs in next time around.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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02-18-2005, 09:42 PM
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#6 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Depending on how you drive, R 43 should be just fine. I run the hotter R 45's in my snow plow truck since it does not get out on the highway much.
Here is a link to the AC numbering system. Jim http://www.acdelco.com/html/pi_plugs_ident.htm |
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