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Author Topic:   plug gap
capri man
Gearhead

Posts: 6417
From: doerun, ga.
Registered: Nov 2000

posted 12-20-2001 06:32 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
i am running a 302 w/gt40-p heads and msd 6al ignition. what should i gap my plugs at?
thanks

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 12-20-2001 06:35 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
heck, i think it depends on the plug you use. what does ford motorsport recomend?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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capri man
Gearhead

Posts: 6417
From: doerun, ga.
Registered: Nov 2000

posted 12-20-2001 08:11 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
i am now running the plugs called for for a 1998 and newer explorer. they had the gt40-p heads. a regular ford plug will not even reach the threads in the head. i dont remember the number on the plug. 735 maybe?

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.

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Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 12-20-2001 08:57 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
.035 is a good starting place.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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capri man
Gearhead

Posts: 6417
From: doerun, ga.
Registered: Nov 2000

posted 12-21-2001 12:44 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
i just checked my old plugs. (300 +- passes)
they are A764 and are gapped at about .052
to much huh!

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 12-21-2001 02:15 PM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
Not sure what kind of ignition system you have, but here are MSD's plug gap recommendations for the 6series:

upto 10.5 CR .050 - .060
10.5 to 13.0 .040 - .050
above 13.0 .035 - .045

7AL is the same except for over 13.0 cr

the recommended gap is .035 - .040

hope this helps.

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Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 12-21-2001 02:33 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
You guys/gals know what? I really hate these maufacturers sometimes. The plug cross referance charts never seem to match up with the competitors. The gap recomendations all differ from the plug people to the ignition people. Doesn't that just drive you crazy?

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 12-21-2001 11:19 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
hey alex, i once read an article that said the best gap for a plug is when the tip was exacly parallel to the deck. the falt surface on the ground piece matched to the flat pinhead surface of the plug. ever hear that? i think i got mine at around .045 or something. hey it fires the cylinder, good enough for me and briggs and stratton. by the way, i dont index my plug in the lawn mower anymore....is that a sign that im getting old?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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