Spark plug issues 68 f00
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
I don’t have the torque setting, but I think a quarter turn after snug is too much for a cone seat.
That might work for a compressible gasket, but you certainly don’t need a quarter turn after snug.
But I’m curious about what the torque is too.
The airhorn of a carburetor or throttle body is generally considered to be the round segment that the air cleaner seals to. However, I think the real definition is just that area surrounding the venturii.
Been so long since I thought about it I guess it’s time for me to actually look it up!
That might work for a compressible gasket, but you certainly don’t need a quarter turn after snug.
But I’m curious about what the torque is too.
The airhorn of a carburetor or throttle body is generally considered to be the round segment that the air cleaner seals to. However, I think the real definition is just that area surrounding the venturii.
Been so long since I thought about it I guess it’s time for me to actually look it up!
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4wd Low
Joined: Dec 2022
Posts: 11
Likes: 1
From: Astoria Oregon
Thank you. I appreciate your response. Some of the plugs were in so deep I had to put a lever on the socket wrench. I could see that if they were old, but they were newer plugs. You are right, I was thinking about the gasket plugs. Almost all cleaned up. I will most likely end up putting on new manifolds and gaskets. After I soak the bolts forever
Logistics Pro
Joined: May 2015
Posts: 4,472
Likes: 969
From: Tri Cities, TN
Spark plug torque
The plug torque on the 14MM plugs is 10-15 ft. lbs. or 120–180-inch lbs.
Those numbers can be found in the distributor section of the shop manual.
Do put a drop of motor oil on the threads before you install them.
You mentioned removing the exhaust manifolds in another post. Be very careful those top bolts are famous for breaking off and are a bitch to repair with the engine in the truck.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Autolite has been owned by Bendix for decades. Ford's brand has been Motorcraft. Next time I would go with keeping a Ford product in a Ford. Ford's part number was BSF32C (copper core) for 1968/71 F100/350 with 360/390. As of 1972 when 360/390 got hardened exhaust valve seats Ford changed the plugs to part number BSF42C. Which is one heat range hotter. I don't see anything on g**gle about BSF32C. As per usual g**gle, everything BUT BSF32C. 
So I would go to Ford or O'Reillys and get part number BSF42C. Stocking number SP420.
With standard points dizzy and stock coil, gap the plugs at .035". Check the points for wear, their gap, and better off yet their dwell with a dwell meter.
So I would go to Ford or O'Reillys and get part number BSF42C. Stocking number SP420.With standard points dizzy and stock coil, gap the plugs at .035". Check the points for wear, their gap, and better off yet their dwell with a dwell meter.
Logistics Pro
Joined: Jun 2018
Posts: 3,554
Likes: 442
Autolite has been owned by Bendix for decades. Ford's brand has been Motorcraft. Next time I would go with keeping a Ford product in a Ford. Ford's part number was BSF32C (copper core) for 1968/71 F100/350 with 360/390. As of 1972 when 360/390 got hardened exhaust valve seats Ford changed the plugs to part number BSF42C. Which is one heat range hotter. I don't see anything on g**gle about BSF32C. As per usual g**gle, everything BUT BSF32C. So I would go to Ford or O'Reillys and get part number BSF42C. Stocking number SP420.
With standard points dizzy and stock coil, gap the plugs at .035". Check the points for wear, their gap, and better off yet their dwell with a dwell meter.
So I would go to Ford or O'Reillys and get part number BSF42C. Stocking number SP420.With standard points dizzy and stock coil, gap the plugs at .035". Check the points for wear, their gap, and better off yet their dwell with a dwell meter.
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Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Why do all that maintenace with points. Pertronics is a great option to points without the failure rate. I'm 7yrs with Pertronics with only one cap, rotor and plug change (not that they looked bad) but habit told me to. Been running Autolite 45's at .044 with good success on 85 octane in a 410ci FE. My reason is a lower octane needs a hotter spark.
Logistics Pro
Joined: Jun 2018
Posts: 3,554
Likes: 442
There is no argument that pertronix and their hotter coil isn't better. Except those purists who want the old school experience. Our current gas doesn't have that much different octane. It's just rated differently than when our rigs were new. Exception being areas where gas is sold with methanal/ethanal. Octane makes no difference to plug gap. The main concern would be how hot the coil is sending out a spark. Stock style coil gap should be as listed back then, .035". A hotter coil then .044/.045. IMHO. Plus, I'm sure your 410 isn't running a stock coil. I know if I had a 410 FE it wouldn't be. Sorry if I sound argument of. I'm not. Not my way.
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