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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 05-30-2010   #1 (permalink)
SDMustangRider is offline GT Member

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Default Spark Plugs for 289 engine

Hey guys again! I know, I know. All these new threads of mine coming up. Tough!:kooky: Anyways, I was told by a shop the other day something about different size spark plugs for the engine. One is longer than the other if I can remember. Maybe someone can help me out on what he probably was talking about. Also, if you have recommendations of what spark plugs to use, let me know. I'm running RPM heads if that helps.
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Unread 05-30-2010   #2 (permalink)
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Hi, makes many posts as you like that's what we're here for! I have my original heads on my 289 and have Bosch platinum plugs. I have been running them for years and have had good luck with them. I also run them in my 2003 stang. They are a little pricey but worth every penny imo.
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Unread 05-30-2010   #3 (permalink)
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Quote:
Originally Posted by havoc65 View Post
Hi, makes many posts as you like that's what we're here for! I have my original heads on my 289 and have Bosch platinum plugs. I have been running them for years and have had good luck with them. I also run them in my 2003 stang. They are a little pricey but worth every penny imo.

Cool. I was looking at Bosch copper plugs (forgot the part number) but they were suppose to be SUPER good plugs, but found out at Autozone they don't carry them anymore, so probably they are just discontinued in general.. Thanks Havoc.
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2004 Nissan Titan Crew Cab
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Edelbrock RPM Performer Heads; bored .30 over
Weiand Stealth Intake, Holley 600 CFM Carb.
Comp Cam 268H 9.5:1 Speed Pro Pistons
Patriot Tri-Y Headers w/ 2.5" H Pipe, Flowmaster 40S
Air ride system with 4 link CSRP Front Disk Brakes.
Ford 8 3.40 trac-loc rear end
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Unread 05-31-2010   #4 (permalink)
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Default Spark Plugs for 289 engine

Hello SDMustangRider,
Be careful when you select a plug for your motor. The plug length has to be correct for the heads. I am not certain what plug you need but I do know you don't want a plug that is too long as it could hit the piston top.

Perhaps some info can be found here:

Spark Plug Guide - Heat Range - Car Craft Magazine

Too short of a plug and the spark will not be in the combustion chamber and too long a plug could hit. You need to research more about the heads.

I am not trying to spook you out but the length is important. You can't just but any plug for a 289 as the article explains.

Keep researching -- - Print Dad
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Unread 05-31-2010   #5 (permalink)
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Quote:
Originally Posted by Print Dad View Post
Hello SDMustangRider,
Be careful when you select a plug for your motor. The plug length has to be correct for the heads. I am not certain what plug you need but I do know you don't want a plug that is too long as it could hit the piston top.

Perhaps some info can be found here:

Spark Plug Guide - Heat Range - Car Craft Magazine

Too short of a plug and the spark will not be in the combustion chamber and too long a plug could hit. You need to research more about the heads.

I am not trying to spook you out but the length is important. You can't just but any plug for a 289 as the article explains.

Keep researching -- - Print Dad

That's exactly what I was talking about in my first post, about my mechanic telling me make sure to get the right plugs. Think it might be best to call Edelbrock and asked them?
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2004 Nissan Titan Crew Cab
1966 Ford Mustang Original 289
Edelbrock RPM Performer Heads; bored .30 over
Weiand Stealth Intake, Holley 600 CFM Carb.
Comp Cam 268H 9.5:1 Speed Pro Pistons
Patriot Tri-Y Headers w/ 2.5" H Pipe, Flowmaster 40S
Air ride system with 4 link CSRP Front Disk Brakes.
Ford 8 3.40 trac-loc rear end
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Unread 05-31-2010   #6 (permalink)
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Quote:
Originally Posted by SDMustangRider View Post
That's exactly what I was talking about in my first post, about my mechanic telling me make sure to get the right plugs. Think it might be best to call Edelbrock and asked them?
This seems to be right
SPARK PLUG 65/95 289/302/351W W/ EDELBROCK HEADS
Mustangs Unlimited - The Premier Source for Mustang, Shelby and Cougar Parts and Accessories
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Unread 05-31-2010   #7 (permalink)
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Thanks 199. They didn't have a price but I did more research on them and I found this plug was recommended by Edelbrock: Champion Spark Plugs 49776 Champion Racing Spark Plugs
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2004 Nissan Titan Crew Cab
1966 Ford Mustang Original 289
Edelbrock RPM Performer Heads; bored .30 over
Weiand Stealth Intake, Holley 600 CFM Carb.
Comp Cam 268H 9.5:1 Speed Pro Pistons
Patriot Tri-Y Headers w/ 2.5" H Pipe, Flowmaster 40S
Air ride system with 4 link CSRP Front Disk Brakes.
Ford 8 3.40 trac-loc rear end
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Unread 05-31-2010   #8 (permalink)
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Find the Autolite equivelant plug.
I have had a lot of problems with Champions - no-fire conditions, high resistance, short life etc.
Autolites have always worked well and last longer than other plugs.
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Unread 05-31-2010   #9 (permalink)
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with the edelbrock head, as with most aluminum heads the autolite 3924 is the correct starting point.
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Unread 05-31-2010   #10 (permalink)
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I ended up getting the Champions but I might order these and send the Champions back.
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2004 Nissan Titan Crew Cab
1966 Ford Mustang Original 289
Edelbrock RPM Performer Heads; bored .30 over
Weiand Stealth Intake, Holley 600 CFM Carb.
Comp Cam 268H 9.5:1 Speed Pro Pistons
Patriot Tri-Y Headers w/ 2.5" H Pipe, Flowmaster 40S
Air ride system with 4 link CSRP Front Disk Brakes.
Ford 8 3.40 trac-loc rear end
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