Stupid Spark Plug Question

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VermontCruizer

New Member
Jun 17, 2009
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Vermont
I have a slant head engine and I was wondering if it matters which way the spark plug is pointed (toward the front or back)? Will the direction effect performance in any way? Thanks.
 

bluegoatwoods

Active Member
Jul 29, 2012
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Central Illinois
It's not a stupid question at all.

But I've got a stupid answer; I don't know.

Still I think that there is some consensus on the issue. The direction, I think, does have some bearing on engine performance. But I don't know what that might be.

But they seem to come from the factory with the spark plug pointing forward, so I just go with that.
 

2door

Moderator
Staff member
Sep 15, 2008
16,302
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Littleton, Colorado
It won't make any difference. The primary reason for the slanted plug was to provide a little more room for engine installation in some frames. Try it. Turn the cylinder head around and compare how your engine runs. You'll see no difference.

Tom
 
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