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New Edge Cobras
Swapping heads 99 cobra
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<blockquote data-quote="FIREBALL" data-source="post: 16177808" data-attributes="member: 178539"><p>The cost to repair the stripped holes with inserts does not even come close to the cost of new heads unless your having a shop do all the work. </p><p>Here is the deal with the spark plug threads---yes Ford didnt put enough threads in, but the real problem wasnt enough threads but not enough torque. Ford thought that because they are aluminum heads they better keep the spark plug torque low, but that is really what has caused most of the problem with sprark plugs blowing out. What happens is with the 14 lb. factory torque, the spark plugs start to back out and finally when they get to the last thread they blow out. The solution is to torque the plugs down to 28lb and in the greater majority of time that stops it from happening. The kits with the solid steel inserts (not helicoil) are the only ones to use to fix the threads. They coast around $250 which includes several new inserts. I had to do two of them on my F150 but since Ive torqued my plugs down to 28lb I have not had another blowout and when I replaced my Cobra plugs they all got torqued down to 28lb. Now if you just want better more efficient heads, thats a different story.</p><p></p><p>Here is the kit I used. <a href="https://www.denlorstools.com/home/dt1/page_21744/mountain_9200_4.6_5.4_6.8_ford_2v_spark_plug_inser.html" target="_blank">Mountain 9200 4.6, 5.4, 6.8 Ford 2V Spark Plug Insert Installer | Hard to Find Automotive Specialty Tools</a></p><p>I did my F150 head while still on the truck, that was quite a challenge.</p></blockquote><p></p>
[QUOTE="FIREBALL, post: 16177808, member: 178539"] The cost to repair the stripped holes with inserts does not even come close to the cost of new heads unless your having a shop do all the work. Here is the deal with the spark plug threads---yes Ford didnt put enough threads in, but the real problem wasnt enough threads but not enough torque. Ford thought that because they are aluminum heads they better keep the spark plug torque low, but that is really what has caused most of the problem with sprark plugs blowing out. What happens is with the 14 lb. factory torque, the spark plugs start to back out and finally when they get to the last thread they blow out. The solution is to torque the plugs down to 28lb and in the greater majority of time that stops it from happening. The kits with the solid steel inserts (not helicoil) are the only ones to use to fix the threads. They coast around $250 which includes several new inserts. I had to do two of them on my F150 but since Ive torqued my plugs down to 28lb I have not had another blowout and when I replaced my Cobra plugs they all got torqued down to 28lb. Now if you just want better more efficient heads, thats a different story. Here is the kit I used. [URL="https://www.denlorstools.com/home/dt1/page_21744/mountain_9200_4.6_5.4_6.8_ford_2v_spark_plug_inser.html"]Mountain 9200 4.6, 5.4, 6.8 Ford 2V Spark Plug Insert Installer | Hard to Find Automotive Specialty Tools[/URL] I did my F150 head while still on the truck, that was quite a challenge. [/QUOTE]
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