The Leaky Head Thread
New User
Joined: Mar 2013
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From: Tulsa, Ok
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Jason! Welcome to FTE! Those gaskets look great. If Bruno ordered them tonite we might could have them Saturday. I'm trying to have things sorta ready so maybe between Sat and Sun afternoon we can get it going.
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Postmaster
Joined: Nov 2009
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From: Broken Arrow , OK
OK was considering just buying a new set of plugs instead of sandblasting the old ones. I will probably eventually blast them , but, not now. World products recommends:Spark Plug: 14mm 5/8" .460" reach tapered style, Accel 276 or 276S or equivalent. I believe the "S" designation is for short and would probably work best with the header application.
However, I am not a fan of accel. I crossed them last time and came up with the NGK UR4 plug which happens to be my favorite brand. Here is a list of what crosses with the Accel 276S:
Bosch HS7E
Champion RDJ7Y
Champion DJ7Y
Denso T20MPU
Denso T14PR-U
Denso stk 5020
NGK 1270
NGK BPM6F
NGK UR4
NGK 5950
NGK BPMR6F
NGK stk 6630
Now all of these cross with all kinds of stuff if you click on them. The NGK UR4 crosses with about a dozen Motorcraft plugs. I am not sure if anybody offers a short variant like accel though.
Give me your thoughts and opinions please.
However, I am not a fan of accel. I crossed them last time and came up with the NGK UR4 plug which happens to be my favorite brand. Here is a list of what crosses with the Accel 276S:
Bosch HS7E
Champion RDJ7Y
Champion DJ7Y
Denso T20MPU
Denso T14PR-U
Denso stk 5020
NGK 1270
NGK BPM6F
NGK UR4
NGK 5950
NGK BPMR6F
NGK stk 6630
Now all of these cross with all kinds of stuff if you click on them. The NGK UR4 crosses with about a dozen Motorcraft plugs. I am not sure if anybody offers a short variant like accel though.
Give me your thoughts and opinions please.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I'm a big fan of NGK. 
BPM6F converts to; 'B'=14mm, 'P'=projected electrode, 'M'=compact, 'nothing'=9.5mm/3/8" reach, '6'=heat range (of 2=hot -->11=cold), 'F'=tapered seat.
The 'R' variant is a resistor plug, for if you have copper plug wires like Packard 440 cable and electronics that would have interference.
I have the naming conventions for NGK spark plugs bookmarked.
http://www.ngksparkplugs.com/techinf...tnumberkey.pdf
The Motorcraft AF42 or AF52 have a 'C' (compact) variant also.
BPM6F converts to; 'B'=14mm, 'P'=projected electrode, 'M'=compact, 'nothing'=9.5mm/3/8" reach, '6'=heat range (of 2=hot -->11=cold), 'F'=tapered seat.
The 'R' variant is a resistor plug, for if you have copper plug wires like Packard 440 cable and electronics that would have interference.
I have the naming conventions for NGK spark plugs bookmarked.
http://www.ngksparkplugs.com/techinf...tnumberkey.pdf
The Motorcraft AF42 or AF52 have a 'C' (compact) variant also.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
A .460" reach .044" gap plug would be BPM6FS-11 in the NGK nomenclature.
But I don't see it offered.
The 1270/5950 are stubby (think weedeater) 3/8" reach type plugs as well.
Generic photo from Amazon,
But I don't see it offered.
The 1270/5950 are stubby (think weedeater) 3/8" reach type plugs as well.
Generic photo from Amazon,
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Good info. Somewhere I have seen a chart that explains the Motorcraft numbering convention, but can't find it. I did find a cross-ref to ASF42C on one of those plugs and was trying to decode it.
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Postmaster
Joined: Nov 2009
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From: Broken Arrow , OK
I can get the 1270. 8 of them should be here Monday. Well at Advanced Auto for me to pick up. I like NGK as I stated above my favorite. Then probably Champion or Motorcraft. Bosch and Autolite fall at the bottom of the list.
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Yes, if you need a .460 reach then using a shorter plug will shroud the tip so that the spark won't be as effective. And, if it is short enough to expose threads in the head you will have hot spots that contribute to detonation.