Spark plugs choice

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moparcuda

moparcuda

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hi,what spark plugs goes on my 440 source heads,my engine is a 451 with Ross pistons 8,5 comp and a 6-71 blower,do I need J or N model,,,,
 
moparcuda said:
hi,what spark plugs goes on my 440 source heads,my engine is a 451 with Ross pistons 8,5 comp and a 6-71 blower,do I need J or N model,,,,
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Neither. The J is too short and the N has a 13/16 hex and you’ll never get the plug in the hole.

You need a C series plug or equivalent. That is 3/4 reach, 5/8 hex and that will fit your heads.
 
yellow rose said:
Neither. The J is too short and the N has a 13/16 hex and you’ll never get the plug in the hole.

You need a C series plug or equivalent. That is 3/4 reach, 5/8 hex and that will fit your heads.
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Thank you,what brand and range do you recommand,i was tinking about champion or ngk
 
You are also going to need a high energy ignition system to keep the fire going under pressure. Might consider a platinum plug.
Might try contacting the blower manufacturer as they have done much research on this subject.
 
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