351M plug gap too big?
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From: South Carolina
351M Plug Gap?
I've got a 77 351M in my 74 F100. The distributor I think is out of the original 360, it's a breaker type dist. The plug gap is .044 for the 351M. Is this to big for the breaker type dist? Should I decrease it or leave it alone?
Mark C.
Mark C.
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Senior User
Joined: Aug 2003
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From: South Carolina
351M plug gap too big?
I've got a 77 351m in my 74 F100. The distributor I think is out of the original 360, it's a breaker type dist. The plug gap is .044 for the 351M. Is this to big for the breaker type dist? Should I decrease it or leave it alone?
Mark C.
Mark C.
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Joined: Aug 2000
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Mark, it depends on which coil you have on it. If it's the points type coil, the plug gap should be .035". If you're using the DuraSpark coil with the clip-on terminals, the plug gap should be .044". It's the energy output of the coil that determines the sparkplug gap.
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Yep, .044" is fine with the Accel coil. It would probably take gaps up to about .050" without misfires. (Some people even go up to .055" with a performance coil.)
A Pertronix Breakerless kit would be an easy upgrade for that distributor. You'd never have to change and set points again.....
A Pertronix Breakerless kit would be an easy upgrade for that distributor. You'd never have to change and set points again.....
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