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Old 12-28-2002, 09:17 PM
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Post spark plug gap

I have a 74 chevy pickup with a mildly hopped up 350. It has a factory distributor with msd cap, blaster 2 coil, petronix breakerless that replaced the points, accel super stock plug wires, and bosch platinum plugs. What do you guy recommend me using for a spark plug gap? Thanks

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Old 12-28-2002, 10:19 PM
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I'd try 40
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Old 12-29-2002, 08:05 AM
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The bosch platinum plugs come pregaped at.060
says on the back of the box not to adjust.
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Old 12-29-2002, 08:14 AM
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For some reason, GM's HEI system is different from other manufacturers, like FORD that runs a large gap.

The proper procedure with a hotter coil is to start at.040 (stock settimg was .035?) and to increase the gap by .001 to .002 in increments to get the most power. If she starts to breakdown, just close the gap until she runs OK.
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Old 12-29-2002, 09:00 AM
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I have em set right now at .050 and it has a little trouble running when cold and when it warms up tends to smoke a little at idle.
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Old 12-29-2002, 09:16 AM
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Sounds like jeting or choke setting. You have the coil for the spark.
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Old 12-29-2002, 09:18 AM
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Sounds more like carburetion. What type are you running? Do the plugs burn clean or is there residue?
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