First Generation Firebird-L Mailing List
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The second digit (in this case 4 or 3) denotes heat range. I don't know the
difference between a 4 and a 3. I use a 45 in my '74 400. The AC Delco
website recommends against using a different heat range, but they probably
have to say that. The first digit (4) is the thread size, so obviously that
has to be the same. Here's the AC Delco web site
http://www.acdelco.com/parts/sparkplugs/identification.jsp
Vince
69 Conv
Northern NJ
http://firstgenfirebird.org/show/closeup.mv?CarID=720
----- Original Message -----
From: "Ridell, Niklas (C.N.)" <[email protected]>
To: "First Generation Firebird-L" <[email protected]>
Sent: Thursday, August 13, 2009 8:35 AM
Subject: [FGF] Spark plugs
First Generation Firebird-L Mailing List
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I was at my parts dealer to pick some AC delco R44S plugs for my 400
engine.
They told me they aren't produced anymore and that I should use the
R43's instead.
Is this true or just bull?
/Niklas
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