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Old 05-03-2013, 12:46 PM
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spark plug question

I have a set of 461 dhumps and I've ran 303 autolite plugs in them. I am having issues with plug wire and header tubes coming together. Is there a different plug I can use that is shorter? In our circle track engine we used champion plugs that were mainly for a briggs and stratton but I didn't know how that would transfer to the street. Also can you use the plugs that are made for the beveled plug hole heads?

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Old 05-03-2013, 02:07 PM
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NGK makes a short plug, so does Autolite, look at their racing plug, #3934 for one.
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Old 05-04-2013, 08:10 AM
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Spark Plugs

Rowdy, To answer your question, No, you cannot use tapered seat plugs in the old double hump heads, they require a gasketed seat plug. Accel 8197 is a shorty plug for this application. Nolan
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Old 05-04-2013, 11:25 AM
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spark plug question

The old pre-71 camel hump heads used a R44 AC Spark Plug. If you cross reference a R44 to a NGK it is a B6S or 3510.
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