Plug choice

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Post subject: Plug choice

PostPosted: Sun Feb 02, 2014 5:53 am

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Turbo Slant 6

Joined: Sun Aug 25, 2013 2:14 pm
Posts: 759
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I read so much conflicting data on what the best plug might be for my 1986 Hydraulic engine. Right now I am running NGKUR4.

I have read recently NGK ZFR5N is a better plug

Any advice on this? and why make the change?

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DusterIdiot

Post subject: Nope..

PostPosted: Sun Feb 02, 2014 8:36 am

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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9714
Location: Salem, OR
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Quote:

I read so much conflicting data on what the best plug might be for my 1986 Hydraulic engine. Right now I am running NGKUR4.

The stock head for your engine will not take the ZFRN plug, you are stuck with the UR4/UR5 plugs with the tapered seat...If you swap to a pre-1975 head with the drool tubes you can then use the ZRFN plug, but get other issues to work with...

Leave it as is.

-D.Idiot