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02-06-2020, 11:01 PM
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#1 |
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Senior Member
Join Date: Aug 2018
Location: Ottawa, ON
Posts: 850
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Spark Plug reach into head - Is this normal?
I have a C59A with C7RA-A heads. I had purchased NGK B-6L plugs which is the recommended one for my year flathead. These are equivalent to the Autolite 216. The reach is listed as 7/16" (11 mm). Looking at it loosely installed (finger tight), it seems to me to be sitting too low, as it doesn't even protrude into the head. There are two exposed threads left, and if torqued properly, I'm guessing it will go deeper into the head by one thread. Is the plug supposed to sit this low?
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02-07-2020, 12:17 AM
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#2 |
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Senior Member
Join Date: Jun 2018
Location: Minnesota
Posts: 347
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Re: Spark Plug reach into head - Is this normal?
I wouldn't be doing any "guessng". Torque it and see.
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02-07-2020, 01:10 AM
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#3 |
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Senior Member
Join Date: Nov 2015
Location: North Pole, Alaska
Posts: 2,651
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Re: Spark Plug reach into head - Is this normal?
Looks ok to me.
You don’t want it deep enough for the valve to slap it. |
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02-07-2020, 01:51 AM
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#4 | |
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Senior Member
Join Date: May 2015
Posts: 8,074
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Re: Spark Plug reach into head - Is this normal?
Quote:
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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02-07-2020, 01:52 AM
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#5 |
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Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
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Re: Spark Plug reach into head - Is this normal?
This is what an H-10 plug with 7/16" reach looks like installed in an EAB head.
Yours should be OK.
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
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02-07-2020, 05:48 AM
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#6 |
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Senior Member
Join Date: Aug 2018
Location: Ottawa, ON
Posts: 850
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Re: Spark Plug reach into head - Is this normal?
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02-09-2020, 01:07 PM
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#7 |
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Senior Member
Join Date: Aug 2018
Location: Ottawa, ON
Posts: 850
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Re: Spark Plug reach into head - Is this normal?
I found the original Champion H11 plugs. I torqued both the Champion and NGK to about 21 ft-lbs. and they about the same to me which is good.
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02-09-2020, 01:22 PM
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#8 |
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Senior Member
Join Date: May 2013
Location: Pa.
Posts: 2,163
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Re: Spark Plug reach into head - Is this normal?
They both look good. A good practice is to check valve 2 plug clearance in a situation ur unsure of.
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Nomad |
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02-09-2020, 01:25 PM
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#9 |
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Senior Member
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,698
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Re: Spark Plug reach into head - Is this normal?
In my mind, as long as the ground strap on the spark plug doesn't go lower than the ledge in the head that surrounds it, there should not be an issue.
Sal |
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