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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#24385 09/10/2004 12:15 AM | Joined: Jun 2002 Posts: 29 Junior Member | | Junior Member Joined: Jun 2002 Posts: 29 | The '58 apache I bought last year has a 1973 307 in it. It's a little tired but it has stopped smoking since I've been opening it up on the freeway. Go figure! I've changed the oil, put air and fuel filters on it( the previous owner drove it without them!)and it's time to address the old rusty spark plugs. It has an aftermarket? electronic distributor and I'm not sure if that should change how I gap the plugs. I think I remember an old post indicating they should be gapped wider than the typical .035. Any thoughts? thanks a bunch. | | |
#24386 09/10/2004 12:29 AM | Joined: Jul 2003 Posts: 55 Member | | Member Joined: Jul 2003 Posts: 55 | As long as the ignition system is up to par, .045 - .050 should work fine. John
1968 Chevy C-10, 250 and 3 speed on floor, Hedman headers, Offy intake, Edelbrock 600cfm 4 barrel, HEI
1966 Chevy C-10, motor and tranny went into the '68. Waiting to be restored.
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#24387 09/10/2004 7:52 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | GM initially went with a wide gap on the first HEI's, but had problems with arcing inside the distributor cap. They cut back to about .045 and stopped the arcing problems.
Fred
52 3600
69 C-10
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#24388 09/10/2004 8:11 PM | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | If you're using the original-equipment type cap and rotor, don't increase the gap much over the original setting. If it's .035" normally, you might try 40 or 45, max. Too much gap with close plug wire spacing in the cap will result in a crossfire occasionally. That's why the super-voltage systems went to big caps and fancy rotors, and 8MM plug wires.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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