Spark plug recomendations?
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Junior User
Joined: Dec 2008
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Spark plug recomendations?
Hi guys.
Just curious if anyone with more experience than me can recomend a good spark plug for my 77 351m, i went to ford and their parts list didnt go that far back heh. The Guy said that they did have them though and that the part number was SP450. Although my Chiltons says the part number is ASF-42B. does anyone know if i should get the motorcraft ones or have any opinions on aftermarket brands? and does a gap of .44 sound right?
thanks for your help. Cheers.
Graeme
77 F250 4x4 4sp 351m
69 F250 2wd 4sp 390
Just curious if anyone with more experience than me can recomend a good spark plug for my 77 351m, i went to ford and their parts list didnt go that far back heh. The Guy said that they did have them though and that the part number was SP450. Although my Chiltons says the part number is ASF-42B. does anyone know if i should get the motorcraft ones or have any opinions on aftermarket brands? and does a gap of .44 sound right?
thanks for your help. Cheers.
Graeme
77 F250 4x4 4sp 351m
69 F250 2wd 4sp 390
The village idiot.
Joined: Feb 2010
Posts: 1,126
Likes: 1
From: Southern WV
Just go to the local parts place, AZ,AA,Napa, etc. Tell them what you've got and get the cheapest copper plugs they have. "Premium" plugs are for premium cars and don't tend to do well in SB ford engines.
Posting Guru
Joined: Mar 2010
Posts: 1,196
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Only plugs I use in my rigs (8 of them, even the 521 stroker) are Motorcraft coppers...and never had an issue with them. The .44 gap is for a stock engine...with my mild builds I usually jump to a .48-.50 gap.
Postmaster
Joined: Apr 2003
Posts: 2,703
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From: Harrisburg, NE
I firmly believe in motorcraft coppers. I side gap them till they start misfiring and close them back up by .005
the only place I would run a platinum plug is in a vehicle that I absolutely hate changing plugs on, like a v6 minivan or a camaro with an lt1 (I can change the engine in my capri just as fast)
I had a chart in a book here, but I can't find it at this second, but it list only one other material that conducts electricity better than copper, and it wasn't platinum.
the only place I would run a platinum plug is in a vehicle that I absolutely hate changing plugs on, like a v6 minivan or a camaro with an lt1 (I can change the engine in my capri just as fast)
I had a chart in a book here, but I can't find it at this second, but it list only one other material that conducts electricity better than copper, and it wasn't platinum.
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