Hey can some tell me what the gap is for a 73 slant six 225 with two barrel carb. Thanks Jim

.035

Does this car have the tube style head or the peanut plug head. If it has the tube style head use Autolite 985 or NGK ZFR5N extended nose plugs.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Yeah it has the tube stlye head it had champion plugs in it thanks for the gap nice car!! How do do get the picture on your post?

Champion plugs suck. Use the extended nose plugs. They are much more efficient.

I am not that good at explaining computer stuff but here is a page that explains more about uploading pictures.

Wish I could be of help, but I am a car guy not a computer guy (what is a spreadsheet?).

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

spreadsheet is something us Mopar guys do when we're done working on our rides for the day and done looking over the slantsix.org forum, hop into bed and please our other lady.

I replaced the Champions in my '64 with the Autolite 985's. It was running well with the Champions, but the high-mileage engine would foul them and at start-up there would be intermittent missing until the engine warmed up. Now it still misses when cold, but also has intermittent missing when warm.

I'm not knocking any plug, but in my experience, Champions are as good, or better than anything else I've used, and I'll be going back to them next time.

I milled my heads 0.090 can I still use the extended tip spark plugs? I would hate to find out the hard way.

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head

Use the special extended-nose NGK plug number ZFR5N gapped at 0.040" if everything in your ignition system is in tip-top shape, 0.035" if you tend to let it slide a little. Remove the metal ring-washers from the spark plugs before installation. Note the ZFR5N plugs require a smaller, 5/8"-hex plug socket to install than the standard plugs will require to remove.

The NGKs are a better-quality plug than the Autolites, which are still tolerable. The Champion equivalent is RN13LYC, but quality and durability are poorer.

0.090" mill should definitely not affect ability to safely run ZFR5N.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Is there a 1 or 2 step colder plug than the 985? or ZFR5N?

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1966 Signet
Turbo Slant Six