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Old Nov 13, 2003 | 11:23 AM
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spark plug?

what plugs do you use in the gt40 heads on the 5.8 lightning motors? plug book calls for a awsf32c long reach plug. tired those and looks like it needs to have short reach asf32c plugs???
 
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Old Nov 14, 2003 | 06:30 PM
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Motorcraft awsf32c are what I am using in my 94. Could your heads have been swapped for regular production 302/351w heads? I don't think the regular plugs are long enough to start the threads in a GT40 head.
 
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Old Nov 17, 2003 | 08:18 AM
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put the asf32c's in and problem is solved. bought a ford reman lightning motor and put in my 74 bronco. hoping it has the right heads on it from ford. any easy way to tell? did not have a roller cam but how can you tell by looking at the heads?

thanks
 
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Old Nov 17, 2003 | 11:41 AM
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If awsf32c will not fit they are not GT40 heads. Sounds like you received a regular production 351 not a Lightning engine. Casting number should help with identification.
 
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Old Nov 17, 2003 | 01:20 PM
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I use the Bosch Platinum 4 plugs and have not had any problems. I got them from Advance auto parts. They can tell you the part #.
 
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Old Nov 17, 2003 | 01:46 PM
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well now i am inquireing if the engine has the correct heads or not. i would hate to find out it has to go back because of a mis-assembeled engine. that would bite having to take the motor back out but i did pay for gt-40 heads.
 
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Old Nov 19, 2003 | 02:22 PM
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was told by ford the replacement head takes the short reach plug. original head is no longer available. was told it was almost exactely the same except for that. seems to run good so guess life is good.
 
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