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Old 04-06-2009, 03:55 PM
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spark plug length

i know it's a quite silly question.
well, i've just cleaned up, painted and covered the headers with the heat wrap and now the #6 cylinder spark plug doesn't fit because there's no enaugh room between that and the headers, that's beat against the wrap...
yes i can redo the job but i would like to avoid that if possible, it's pretty boring and even long.
i don't know exactly the cause of this issue, may be the new alu heads and the new heat wrpa bendage, reading the Edelbrock instruction i saw they reccomend Champion spark plugs because shorter than others, well i've the stock ac delco now rc45ts, they seems to be pretty tiny, i remember the Champion rn12yc bigger and with bigger thread too, i've used them in the AMC...
i've took some measurement to my spark plug and the are around 63-64 millimeters from the begins of the thread to the end of the plug.



there's somebody sooo gentle that can grab the measure of the RN12YC or whatewer can be used in a SB chevy, smaller than the RC45TS delco?
any help will be apprecciated

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Old 04-06-2009, 04:09 PM
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Champion #rv12c measures 2 1/2 inches same as the acell u groove shorty plugs for headers.
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Old 04-06-2009, 04:15 PM
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wow!thank you so much for the prompt answer, mine measure 2,1/2 as well.

do you know if brand like Autolite, Bosch , NGK,makes shorter plugs?
thank you again

Last edited by jeepers creepers; 04-06-2009 at 04:22 PM.
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Old 05-08-2009, 07:02 PM
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I use accel 276s which if you measure from the top where you connect the plug wire to the bottom of the ceramic is 1.5". I had the same exact problem and the shorty plugs were perfect.

Accels website has a PDF file list of all the lengths.

Also, the plug you have has a really long shaft above the threads which is making the plug even longer.

Sorry to drag up an old post
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Old 05-09-2009, 12:12 AM
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Quote:
Originally Posted by bubbahotep
I use accel 276s which if you measure from the top where you connect the plug wire to the bottom of the ceramic is 1.5". I had the same exact problem and the shorty plugs were perfect.

Accels website has a PDF file list of all the lengths.

Also, the plug you have has a really long shaft above the threads which is making the plug even longer.

Sorry to drag up an old post
you're very welcome, thank you!
finally i've took off the shorty and did some mods to the pipe ( i hope to haven't made damage nothing reducing the gas pasages too much), now there's a decent clearance between spark plug and headers but a little extra room is very welcome, so i'll probably go with the model you seggested to me.
thank you!
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Old 05-09-2009, 10:02 AM
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Here's the Accel cross reference. You can go with another plug brand by using the reference. I use the 276s as my "size" reference. There are several plugs the same short size with different specs (resistor or non resistor, tapered seat etc). The 276s has a short thread but there's others that have longer threads (to go deeper into the cylinder) and are still shorter on the boot part

http://go.mrgasket.com/pdf/sparkplug..._reference.pdf

EDIT: I just got back from Advanced Auto and went through at least 12 plugs that were cross referenced as matches and they were WAY WAY wrong in size. I picked up NGK UR5 which is only 3/16" longer overall than the 276s. So far the 276s is the shortest I have found. The 276s has no resistor while the NGK UR5 does have one (recommended for anything computer controlled to avoid interference)

Last edited by bubbahotep; 05-09-2009 at 04:14 PM.
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