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Old 09-30-2011, 07:43 PM
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Spark Plug Suggestion Please?

I'm getting pretty close to being done on my motor, and haven't found anybody that has said what plugs they are using for this kind of setup. If anybody could help me out I'd appreciate it. SB 350, with the Vortec heads, Keith Black 142.030 pistons, Howards cam HRS-CL112011-11, Edelbrock 2116 with a Quadrajet. HEI distributor, Anymore info? Lemme know, thanks for the help! Part number would be great!

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Old 09-30-2011, 10:20 PM
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Get a set of AC delco plugs for a 1997 chevy truck with a 350, only get`em a step colder.
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Old 10-01-2011, 08:36 AM
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Thanks a bunch! Just one step closer!
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Old 10-01-2011, 10:50 AM
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Problem with this, Autozone claims the Number 12 AC Delco is a number 2 on the heat range. However, AC Delcos site says its a number one? How do you cold colder than a number 1?I think the numbers get colder as they go down don't they?
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Old 10-01-2011, 11:17 AM
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Just buy some plugs, install 'em and run 'em for a while. To check the heat range, pull a plug and look at the ground strap. There will be a color change or a point somewhere on the strap where it changes appearance as a result of the combustion process. You want the change to occur at about the point of the bend in the strap. If it changes closer to the tip of the strap, then the plug is too cold. If it changes closer to where the strap is welded to the spark plug body, then the plug is too hot.

For checkin' lean/rich fuel mixture, hold the plug with the ground strap toward you, like you're lookin' down into the ceramic insulation. On the very end of the spark plug body, at the end of the threads where the strap is welded on, there will be deposits of the combustion process. What you want to see there is a light gray color, like a cigarette or cigar ash. Lighter will be too lean, darker will be too rich. Oily will indicate a problem, such as an internal vacuum leak from the crankcase. If the bottom of the intake manifold ports are not sealed to the head on the crankcase side, then the oily vapors from the crankcase will be drawn past the leak and into the combustion chamber when the motor is on the intake stroke.

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Old 10-01-2011, 12:00 PM
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perfect thanks!
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