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Old 04-11-2009, 04:51 PM   #1
wickedstang942000
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Default what sparkplugs and gap

hey guys i'm building a 351 windsor stroked to 445 ci. it will have a ysi vortech sc making about 20 lbs of boost. would xp 3924 autolites be a good choice for plugs and what would be proper gap for that much boost. thanks for a response
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Old 04-28-2009, 05:58 PM   #2
buddha
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Default Re: what sparkplugs and gap

I use the Autolite 3923's with no issues. With 20 psi and a good aftermarket ignition, I'd say try the gap at round .035
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Old 04-28-2009, 06:03 PM   #3
wickedstang942000
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Default Re: what sparkplugs and gap

thanks for the response. i've got a set of xp 3924,s. is the 3923 a colder plug.
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