[DeTomaso] Spark plugs

Mike Thomas mbefthomas at comcast.net
Sat Jun 6 10:20:03 EDT 2009


Thanks.  I've got a 381 stroker with 10.0:1, running 92 with a light octane
boost.
By your comment, thinking I may need to switch to the Boss plugs.
Mike

-----Original Message-----
From: Rich [mailto:hoppe1 at cox.net] 
Sent: Friday, June 05, 2009 7:49 PM
To: Charles Engles; Mike Thomas
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] Spark plugs

Plugs for a 72 are probably OK for the low compression street motor If you
are running high compression by todays standards with premium gas and on the
edge compression, I use the same plugs as a boss 351 cleveland 1971 Rich
----- Original Message -----
From: "Charles Engles" <cengles at cox.net>
To: "Mike Thomas" <mbefthomas at comcast.net>
Cc: <detomaso at realbig.com>
Sent: Friday, June 05, 2009 7:20 PM
Subject: Re: [DeTomaso] Spark plugs


> 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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