[DeTomaso] Spark plugs

[Charles Engles]

Dear Mike,


              Alas, I can't give you a specific recommendation.   I can't 
even find the written note lost somewhere here at the Pantera Research 
Institute that has the specifics for the plugs in the current Mark II 
engine.    I do think that if you stay away from the AFR plugs,  then you'll 
be safe.  I think if you use the recommended street Autolite plug for a 1972 
Mustang 351C, then you should be fine.    In my limited experience I can 
safely say do not use any platinum plugs.   Hopefully, a better answer will 
surface on the forum.

                                   Warmest regards, Chuck Engles


----- Original Message ----- 
From: "Mike Thomas" <mbefthomas at comcast.net>
To: <cengles at cox.net>; "'Ian H'" <ihannington286720mi at comcast.net>
Cc: <detomaso at realbig.com>
Sent: Friday, June 05, 2009 8:18 PM
Subject: RE: [DeTomaso] Spark plugs


> What temp / rating would then be the recommended plug.  When I bought the
> set of Autolites I just put in, I asked for plugs for a 72 Mustang with a
> 351 C.  Didn't look at the box, just gapped them and put them in.  Pulled 
> a
> few after about 50 miles and they look fine.
>
> Mike Thomas
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] 
> On
> Behalf Of cengles at cox.net
> Sent: Friday, June 05, 2009 1:52 PM
> To: Ian H
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Spark plugs
>
>
> Dear Ian,
>
> I checked with the Autolite Customer Service line. The R stands for Race
> application and, in my experience, a colder plug ill suited for street 
> use.
> When used on the street they rather quickly foul.
>
> Warmest regards, Chuck Engles
>
>
>
> ---- Ian H <ihannington286720mi at comcast.net> wrote:
>>I figured that the R may stand for resistor, but I thought I ask the
> "experts" anyway.
>
> Ian
> ----- Original Message -----
> From: JDeRyke at aol.com
> To: ihannington286720mi at comcast.net ; detomaso at realbig.com
> Sent: Friday, June 05, 2009 1:54 PM
> Subject: Re: [DeTomaso] Spark plugs
>
>
> In a message dated 6/5/09 4:53:37 AM, ihannington286720mi at comcast.net
> writes:
>
>
> What is the diference between Autolite AF-42 and ARF-42 plugs? The ARF's 
> are
> listed for Boss 351, and the AF's are for standard 351 C's.
>
>
> I'm guessing, Ian (since I haven't called up Autolite's website), but the
> ARF-42s are likely resistor plugs while the others are not. The heat 
> ranges
> etc should be the same for both. Best guess- J Deryke
>
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