Small block shorty plugs

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mitch
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Small block shorty plugs

Postby mitch » Thu Aug 31, 2017 9:17 am

Anyone have a spark plug recommendation for a small block chevy that is the shorty style. The car has AC delco cr43ts in it now and I am looking for something with more clearance for the headers
Thanks Mitch

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Re: Small block shorty plugs

Postby pamotorman » Thu Aug 31, 2017 12:38 pm

a lot of lawn mower plugs are shorter the regular plugs

DCal
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Re: Small block shorty plugs

Postby DCal » Thu Aug 31, 2017 2:08 pm

Acell used to sell a line of header friendly plugs but I can't remember any specific numbers.

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Re: Small block shorty plugs

Postby mitch » Thu Aug 31, 2017 2:41 pm

I wound up using NGK 5673-7
thanks Mitch

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Re: Small block shorty plugs

Postby Cutlassefi » Thu Aug 31, 2017 4:59 pm

FYI
https://www.holley.com/brands/accel/pro ... ark_plugs/
And it's Accel, not Acell. :D Just sayin.
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MikeB
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Re: Small block shorty plugs

Postby MikeB » Wed Sep 06, 2017 8:52 am

I've used NGK and Bosch "ISO" style plugs to clear header tubes on several engines. Here's a comparison to a standard plug:

Image

Zmechanic
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Re: Small block shorty plugs

Postby Zmechanic » Wed Sep 06, 2017 9:37 am

The autolite AR13x and AR13 series are just as short as the Accel "shorty" plugs, too. For whatever reason, they only seem to have AR13, which is a cold projected tip, or AR13x, which are various heat ranges of non projected tip.

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MadBill
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Re: Small block shorty plugs

Postby MadBill » Wed Sep 06, 2017 9:46 pm

You know, I always ASSumed that shorty plugs had shorter insulators, leading (all else equal) to increased chance of spark tracking, but for this pair, the shorty has a slightly longer insulator! Why can't all common plugs be similarly shrunk? (I bet F1 plugs look like model aircraft glow plugs)
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Re: Small block shorty plugs

Postby HotRodRay » Tue Sep 12, 2017 12:58 pm

MadBill wrote:You know, I always ASSumed that shorty plugs had shorter insulators, leading (all else equal) to increased chance of spark tracking, but for this pair, the shorty has a slightly longer insulator! Why can't all common plugs be similarly shrunk? (I bet F1 plugs look like model aircraft glow plugs)

Dialectric grease greatly reduces spark tracking.


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