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Whick spark plugs for Gray/Buick 215 V8?

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Whick spark plugs for Gray/Buick 215 V8? « Previous Next »

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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 33
Registered: 10-2010
Posted on Thursday, June 28, 2012 - 04:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi there!
I have a 215 V8 from Rover/Buick/Gray and I canīt find which type of spark plugs to use. Iīm not sure if the old ones are correct when the engine never has been used in the boat before, itīs a marin converted car engine!
The holes for the plugs are also so narrow that you canīt use a ordinare spark plug tool for removal!
HELP, please!!
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Jim Staib
Senior Member
Username: drrot

Post Number: 124
Registered: 09-2008


Posted on Thursday, June 28, 2012 - 08:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

AC brand 44ffs
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 38
Registered: 06-2010
Posted on Thursday, June 28, 2012 - 01:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The champion book says RJ12yc. the ac 44ffs crosses to champ RL95yc the 95 denotes a special industrial or marine plug.All of thease plugs are listed as 13/16 hex,but at some point didn't gm go to the 5/8 hex.
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Ernie
Senior Member
Username: ernie

Post Number: 1516
Registered: 01-2002


Posted on Thursday, June 28, 2012 - 02:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I seem to remember that GM wnet to the 5/8s hex after production of the 215 cu in engine family had gone to England and Gray Marine
Buick and Olds only produced them 61 to 63
The small spark plugs showed up in the 70s
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 34
Registered: 10-2010
Posted on Thursday, June 28, 2012 - 04:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanx for all your answers!
What kind of no for a NGK plug?
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 39
Registered: 06-2010
Posted on Thursday, June 28, 2012 - 07:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

rj12yc is listed as ngk bpr6s. I don't have alisting for the others.
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 35
Registered: 10-2010
Posted on Friday, June 29, 2012 - 10:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ok, thanx!
Is the bp6rs and orter listed above are the ones with the smaller hex?
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 40
Registered: 06-2010
Posted on Friday, June 29, 2012 - 11:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

No all the ones listed are 13/16. I was thinking that maybe you might have a newer replacement head with smaller plugs as your wrench did not seem to fit.I was remembering back then when they bought a new turck in 1970 all at once the sparkplug sockets didn't work anymore.
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 36
Registered: 10-2010
Posted on Friday, June 29, 2012 - 04:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I don't follow you here, sorry!
Is there never head that would fit?
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 37
Registered: 10-2010
Posted on Tuesday, July 03, 2012 - 05:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I'm really confused now!
I have this plugs to choose from, which is right?

AC MR43T
AC MR44TS
AC MR44FFS
CHAMPION RJ12YC
CHAMPION RL95YC
NGK BPR6S
NGK BPR6FS

I want to use a 16 mm, or 5/8" tool.
Is the seating for the plug conical or flat in theese engines?
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 41
Registered: 06-2010
Posted on Tuesday, July 03, 2012 - 06:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

the ac mr44ts crosses to a champion rv12c which is a 5/8 hex and taper seat on 14mm threads.The mr43t is a slightly cooler plug of the same.If those came out of your engine all the plugs we listed are NOT taper, but about the same heat range. You need to look at your head and see if you have the taper.
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 38
Registered: 10-2010
Posted on Wednesday, July 04, 2012 - 03:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

OK Lawrence!
I will check again but as I remembered it looked liked itīs tapered?
Doesnīt all cylinder heads have this taper in the spark plug hole? How can I see if itīs made for a flat or tapered plug??
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 42
Registered: 06-2010
Posted on Wednesday, July 04, 2012 - 12:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Before 1970 most cylinder heads did NOT have tapers and used plugs with flatish washers.There should be a similar taper on the head as is on the plugs if it uses taper plugs.If someone just forced some taper plugs in there there will be just small flareing from the wrong plugs forced in.i have several engine made before 1970 and after and if you don't know the year you have to look and see whats in them.
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 39
Registered: 10-2010
Posted on Thursday, July 05, 2012 - 03:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

OK, I will check during the weekend Lawrence! :-)
I had 8 plugs over when I changed in my 69 Camaro and they are AC R44TS and should probably fit and work just for a start up!
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 40
Registered: 10-2010
Posted on Tuesday, July 10, 2012 - 12:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I will to for the flat spark plug now that I 've seen the home for the plug! Is it still the AC 44ffs that is the correct ones?
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 43
Registered: 06-2010
Posted on Tuesday, July 10, 2012 - 06:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Yes if you can find them.
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Hakan Pettersson
Advanced Member
Username: hugger69

Post Number: 41
Registered: 10-2010
Posted on Wednesday, July 11, 2012 - 05:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

OK, are they hard-to-find stuff?
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Jim Staib
Senior Member
Username: drrot

Post Number: 126
Registered: 09-2008


Posted on Wednesday, July 11, 2012 - 11:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

http://www.ebay.com/itm/8-Atlas-479-Spark-Plugs-1960-66-Buick-Chevy-Oldsmobile-C hampion-L-92Y-/290681100330?pt=Motors_Car_Truck_Parts_Accessories&hash=item43adf 1982a&vxp=mtr

http://www.ebay.com/itm/61-62-63-Buick-Special-215-Aluminum-V8-NOS-Spark-Plugs-/260935313406?pt=Vintage_Car_Truck_Parts_Accessories&hash=item3cc0f4e7fe&vxp=mtr

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