Best Spark Plug
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Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
Best Spark Plug
I know there are probably 20 different types of plugs out there so I will probably get 20 different opinions, but I need an opinion. I run a 1977 F250 with a 460 engine. It is only slightly modified with stock intake and exhaust manifolds. I run a 750cfm Edelbrock carb and dual 2-½ exhausts into a single 3 out Flowmaster. The heads are ported with the smog bumps removed. Stock cam with a milodon double roller chain running straight up. The rocker arms are Crane rollers. I am using a MSD ignition with MSD Super Conductor wires. A big part of my driving is pulling a 6500lb 5th wheel through deserts and mountains. This amounts to a lot of open throttle hard pulling. What type and heat range of plug would be best for this type of driving. I am really interested in hearing your opinions. Gary
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
I believe in running (at least) one heat range cooler plug than recommended by the manufacture when towing. IMHO, all the fancy tips and "truck" plugs are a sales gimmick to get your money. I have found that Ford liked to run extended tip plugs in their cars and standard tips in their truck (haven't a clue why). By going one heat range (or more) colder and running the extended tip plugs I gotten the any benefits of the high dollar plugs might give without the expense.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Depends on the brand. Usually their web site will have an explaination of their numbering system. I happen to understand Champion's system. The number tells you the heat range, lower number = lower heat range, higher number = higher range range. A RF11YC =
R = radio surpressed
F = size and reach of the threads
11 = heat range
Y = extended tip
C = copper alloy
R = radio surpressed
F = size and reach of the threads
11 = heat range
Y = extended tip
C = copper alloy
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