Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#2
02-05-2018, 12:39 AM
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AC Delco Acniter R44 is the go to plug for Z/28 as far as I know. Many people run the hotter R45 and some have tried the colder R43 plug but they're usually not well suited to the street and tend to foul.
I got a set of R43 off eBay a couple years ago and last year got a couple sets of R44 from another member here on the forums.   
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
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#3
02-05-2018, 03:42 AM
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If by "correct" you mean what it came with from the factory, that would be R43.
Most guys run R44. They don't seem to foul as easily. Some guys claim the R43 helps keep detonation down.
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Don't believe everything you read on the internet ... Ben Franklin
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#4
02-05-2018, 12:05 PM
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Checked my notes and the assembly-line correct R43 plugs should have 4 equal green bands and the word 'ACNITER' on the porcelain.
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Tim in NSW, Australia 1969 Van Nuys 04A Z/28 from Clippinger Chevrolet. Cortez Silver with dark blue interior. Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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#5
02-05-2018, 03:39 PM
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I have a box of R43N and the outer carton says "New" Acniter. Anyone know the difference between the R43 and the R43N?
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I like solid lifter cars, big cams and cars w/ 3 pedals in them.
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#6
02-05-2018, 04:19 PM
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Quote:
R43N is a 3/4 inch reach plug.
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...................... John Brown This isn't rocket surgery..... Last edited by John Brown; 02-05-2018 at 04:20 PM. Reason: fat fingers
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| The Following User Says Thank You to John Brown For This Useful Post: | ||
NorCam (02-05-2018) | ||
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#7
02-05-2018, 06:08 PM
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Quote:
Honestly, I like my Holley's. They burn good winter-summer with no real issues.
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#8
02-05-2018, 07:03 PM
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----Big believer in Autolites in a driver!......Bill S
Last edited by olredalert; 02-06-2018 at 01:55 PM.
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#10
02-06-2018, 02:58 PM
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I run Autolites in mine. I see better results with the heat range changes. I tune mine with a wideband to dial the carb in nearly perfect. Living up here at 5,000 ft I routinely drive the car down to sea level so I tend to tune where I find a happy spot for both.
I found the Autolite 86's work best. Equivalent to ACR45S (extended tips). They stay clean up here at 5,000 ft running just slightly rich 12.5-12.8-ish AFR's, and low to mid 13 AFR's at sea level. I stagger jet the carb for best results. Wife drives it daily up here and routinely gets 14.2-14.5 mpg with it in stop and go traffic.
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wrench (02-07-2018) | ||
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