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Discussion Starter · #1 ·
a few days a go i went to Autozone and i was looking for a new set of spark plug for my 5.0 roller engine, so i go and buy a set of ASF42C (motorcraft) when i try to install in my heads the sparks dont bolt, so i remplace that for the AWSF42C (motorcraft to) this spark fits well in my heads (ET7?) so mi question is if the E7T heads come whit the ASF42C, what type of heads i have in my mustang if they use the ASWF42C? :confused: :confused:
 

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I am not sure. The spark plug is almost the same. The differance is the "W" means longer threads.
 

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Discussion Starter · #3 ·

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The stock replacement for GT40 irons are AWSF-32C. You can use the AWSF42C. How you ID GT40 heads keep looking down the line in this forum there are quite a few threads on this.
 
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