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Old 04-10-2006, 01:10 PM
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Spark plug recommendation for 6-71 SBC

Just getting back into hot-rodding after a 30-year hiatus!!! Building a Chev 355 with a 6-71 blower using World S/R Torquer heads, KB blower pistons (8.5:1), Comp 224/226/112 "blower" cam, MSD 6AL & billet distro, 2x Edelbrock 600s re-jetted for the blower. World Products tech sheet says I need taper-seat 5/8" reach plugs. Blower supplier says I need to go 1-2 heat ranges colder than "normal" on the plugs. That's it! That's all I have to go on to pick plugs! The counter monkeys at the big box parts stores are no help cuz I can't give em a year-make-model to plug into their computers (motor is going into a T-bucket).

A little guidance would be appreciated!!

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Old 04-10-2006, 02:18 PM
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Spark plug recommendation for 6-71 SBC

Welcome to the site. Your T sounds interesting. Hope this brings this thread to the front page long enough to get you some answers.
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Old 04-10-2006, 07:18 PM
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i would recommend NGK # r5673-8 or r5673-9. The -8 is one step hotter than the -9.
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Old 04-10-2006, 08:07 PM
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Quote:
Originally Posted by XNTRCI-T
... Blower supplier says I need to go 1-2 heat ranges colder than "normal" on the plugs. ...

http://www.autolite.com/pdf/HeatRangeFacts.pdf

http://www.autolite.com/pdf/Autolite_HP_Apps.pdf

http://www.autolite.com/pdf/RacingCrossRef.pdf

Autolite AR23 is a good starting point
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Old 04-11-2006, 10:20 AM
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Thanks for the help, guys!
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