Will these spark plugs work?
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From: Austin TX
Will these spark plugs work?
I heard a miss on the right side and was getting a recurring pop out of my right side pipe. I guessed it was a plug and yup it was.
So, these new plugs are about 3/8 of an inch longer than my old ones. They are the ones the autoparts store said are form my 427.
I guess they would just ignite closer to the piston but I am worried about them smacking the piston.
Any input from you techie guys???
So, these new plugs are about 3/8 of an inch longer than my old ones. They are the ones the autoparts store said are form my 427.
I guess they would just ignite closer to the piston but I am worried about them smacking the piston.
Any input from you techie guys???
Le Mans Master
Joined: Oct 2006
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
GM BB aluminum heads use a 3/4 reach, 14mm thread, gasket seat spark plug. Heat range is pretty much up to the owner these days, but if memory serves it was an AC 44S originally. Im using Autolites so I can use the 5/8 hex to clear the headers.
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From: Austin TX
OK, time to change my skirt. These are for an old BMW.
But for the record:
Chevy 454 4 bolt mains
All ARP bolts
Aluminum Pro Topline rectangular port heads
10.5 to 1 compression
Bored (.030)
Scat forged crankshaft
Scat forged I beam rods
Probe forged pistons
Speed Pro moly rings
King engine bearings
Billet timing chain
Manley stainless steel valves
Comp xe 284 CamFlat Tappet
Isky roller rockers
Holly 800 DP
Hooker Headers
But for the record:
Chevy 454 4 bolt mains
All ARP bolts
Aluminum Pro Topline rectangular port heads
10.5 to 1 compression
Bored (.030)
Scat forged crankshaft
Scat forged I beam rods
Probe forged pistons
Speed Pro moly rings
King engine bearings
Billet timing chain
Manley stainless steel valves
Comp xe 284 CamFlat Tappet
Isky roller rockers
Holly 800 DP
Hooker Headers
Drifting
Joined: Mar 2011
Posts: 1,886
Likes: 9
[QUOTE=Doug1;1582389900]I would be scared to use those longer plugs, especially being the opinion of an auto parts guy. I've spent enough time around those guys to not trust them on something like this[/QUOTE
]Yeah. I wouldn't be surprized if the piston smacks that plug that on the first rotation of the engine.
Don't use them.
]Yeah. I wouldn't be surprized if the piston smacks that plug that on the first rotation of the engine.
Don't use them.
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From: Palm Harbor, Florida
Race Director
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From: Florida
Aside from the possible interference, the threads will be exposed and can lead to pre ignition and also can carbon up and destroy the threads, especially in aluminum heads upon removal.
There should be no threads exposed in the combustion chamber.
There should be no threads exposed in the combustion chamber.
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From: Palm Harbor, Florida
very interesting, thanks. shows, there seems to be a reason for everything when it comes to how things are designed, nothing is circumstantial
Instructor
Joined: May 2011
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From: Orange Ca
FWIW I've tried nearly every popular brand ..including E3's (the worst)...the plugs I have found that run the best (so far) are these... .054 gap. I am running AFR heads in the Vette and Edelbrock oval ports in my Camaro...
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From: Austin TX
Thanks for all of the posts. I went with the AC Delcos' recomended on the conversion chart from the head manufacturer.
The Autolites with .054 look intersting though.
Very good point from noonie, the sharp (thin) exposed threads would likely cause detonation just like a metal bur would if it were hanging in the combustion chamber.
Backing carbon packed threads back out through the aluminum threads in the head would also be something I wouldn't want to subject my head to...
My car is so ready to paint I just can't pull the trigger. Factor color was white but I would rather go with a red or black. The white just doesn't bring out the C3 curves and lines. Sorry to jump topic.
Thaks again,
M
The Autolites with .054 look intersting though.
Very good point from noonie, the sharp (thin) exposed threads would likely cause detonation just like a metal bur would if it were hanging in the combustion chamber.
Backing carbon packed threads back out through the aluminum threads in the head would also be something I wouldn't want to subject my head to...
My car is so ready to paint I just can't pull the trigger. Factor color was white but I would rather go with a red or black. The white just doesn't bring out the C3 curves and lines. Sorry to jump topic.
Thaks again,
M
Safety Car
Joined: Sep 2012
Posts: 4,688
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From: Palm Harbor, Florida
Thanks for all of the posts. I went with the AC Delcos' recomended on the conversion chart from the head manufacturer.
The Autolites with .054 look intersting though.
Very good point from noonie, the sharp (thin) exposed threads would likely cause detonation just like a metal bur would if it were hanging in the combustion chamber.
Backing carbon packed threads back out through the aluminum threads in the head would also be something I wouldn't want to subject my head to...
My car is so ready to paint I just can't pull the trigger. Factor color was white but I would rather go with a red or black. The white just doesn't bring out the C3 curves and lines. Sorry to jump topic.
Thaks again,
M
The Autolites with .054 look intersting though.
Very good point from noonie, the sharp (thin) exposed threads would likely cause detonation just like a metal bur would if it were hanging in the combustion chamber.
Backing carbon packed threads back out through the aluminum threads in the head would also be something I wouldn't want to subject my head to...
My car is so ready to paint I just can't pull the trigger. Factor color was white but I would rather go with a red or black. The white just doesn't bring out the C3 curves and lines. Sorry to jump topic.
Thaks again,
M
Last edited by Doug1; Nov 27, 2012 at 07:52 AM.
Safety Car
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From: Palm Harbor, Florida
just realized about my above statement about "ANY" sports car, we painted the 350z white, but it was already white, but it is pearl white so that's kinda different then just white. It does look cool though.