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Old 08-19-2006, 07:24 PM   #1
meknized
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Join Date: Jul 2004
Location: wichita Ks.
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Default spark plugs for GT-40X heads

Hello,

I have a question on some spark plugs. I have the GT-40X heads on a 331. I was just changing the spark plugs which are autolite 764's. It has been at least 3 years since I have changed them. One of the plugs in back on cylinder 4 was a champion RS12YC and the other 7 were the 764's. I remember after pulling them that I had broken one of the plugs and that is why I must have put the champion back in. The problem is, is that the autolites have about 3/8 long thread section that goes into the head and the champion have 5/8. I guess I didn't compare them when I had them out. Are the autolites I have been running not reaching in all the way into the combustion chamber? So I need to know if I need a long treaded plug. I can't get my head down far enough to see.
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meknized

Blue/silver 89 GT, Coast 331, ported GT-40x heads, X cam, cobra intake, 70mm TB, 75mm bullet, mac intake, 24lb inj, 255 lph fuel pump, accufab regulator, pulleys, MSD coil, 6AL, 300+ wires, Tremec 5 spd. pro 5.0 shifter, FMS drive shaft, headers, X-pipe, flowmasters, auburn pro series posi. moser 31s axles,3:73s, etc. Best ET 12.02@112.5
a pic A vid of a run:http://www.youtube.com/watch?v=l9JMcErxML8
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