I have Autolite copper 26 spark plugs in my 1976 302. Is Autolite good to go or should I try a different name brand as I'm getting ready to buy new.

 

You might give Motorcraft a try. They are at least as good as Autolight. Whatever you do, don't get platinums. They might last longer, but they just don't provide power like a copper or maybe nickel spark plug does.
I've run Splitfires in Ford 302s and had good results too - even though everyone seems to dog that brand.

 

Motorcraft or Autolite for me. I would never buy a plug with more than one ground electrode. That's just more room to fool or go bad. Plus, think of electricity as a water hose, voltage is your flow of water. With one exit you get a higher flow and more pressure. With two, three, or four exits, the flow (or voltage) is reduced, resulting in a weaker spark. This was proved back in the 90s. The only reason why they are still on the market is because people still buy them not truly knowing what is going on.

While a copper core plug will definitely get the job done, the best plugs are in fact double platinum. Currently Autolite Double Platinum are the best on the market per multiple sources. They last the longest and can take the heat for longer.


Autolite APP5224 Double Platinum Spark Plug

Autolite APP5224 Double Platinum Spark Plug

These extremely long-lasting spark plugs offer platinum to platinum firing. They feature not only platinum tips but the platinum center and side electrodes as well, which makes this plug incredibly durable. If you are looking for a plug that will help you achieve better fuel economy, then this product is for you.
Your car will run better than ever with these plugs. The center electrode fires quickly and cleanly, which makes the engine startup even easier. You will experience faster acceleration and high performance.
pros.

• Steel shell is plated with nickel, making it extra resistant to corrosion
• Platinum to platinum firing for durability and high performance
• Center electrode fires quickly and cleanly for an easier startup
• Allows for better fuel economy
• Resistant to gap wear, so the plug is incredibly long lasting

cons.

• Need to be manually gapped

 

I like NGK just cause I decided to. I've never had a bad sparkplug from any brand in any car. I typically just get the cheapest one with whatever features I like, copper, irdium, etc.
If it's on sale, get it. So long as it was manufactured correctly a copper plug is a copper plug.

 

I wouldn't be ashamed to put NGKs in my Fords. NGKs are good too.

 

I put Bosch platinums in my first 79/460 and boy, did that make it scoot! Tried them in my current trucks and didn't really see any benefit.


Back to MotorCraft...

 

My Dent runs standard Autolights. Per OE specs. And is happy with them. Also low cost.

My newer DD's run various forms of platinum. Per OE specs. Longer change interval is nice if running 20-40k miles/year.

For the Dent, the (possible) longer life of Platinum is not meaningful or helpful. I don't run it high miles. Also, I may well change up the engine before the plugs actually wear out anyhow.

I run standard type (ie copper core) NKG plugs on a hotrod. It is happy also and same comments apply.

 

I used to run nothing but Autolites until I found "made in China' on the box. I now run NGK which are made in Japan. Very good quality plugs.

 

Most spark plug manufacturers have made some batches which they are not proud of. Yet most plugs can do a good job. The upscale models will last longer, but if you don't go for extended replacement periods or are running a high secondary voltage system, they may not be needed.
Your old plugs can help you decide. Try to "read" them. They can tell you if you should use the same heat range or a different one. Here are some examples:
http://4.bp.blogspot.com/-j0zzs4Ml8N...ug+Reading.jpg

The Chinese have made great strides in many fields, yet there remains some shortfalls in auto parts. Some are O.K.; some are junk. Be careful.

Also be careful during installation. An error there can cause diminished performance.

 

Bosch is now made in china,that is why many have switched to NGK for their chainsaws in the Forestry Feild

 

I'm back again with more spark plug woes. I have now bought three sets of Autolite copper 26 spark plugs, My first set had black body that screwed into the engine block. and worked excellent until I did some engine work and ended up oil fouling them while trying to tune my engine back in. My 2nd and 3rd set I bought had a chrome body that screwed into the engine block and I never felt as happy with the performance from these sets. I want to try Motorcraft spark plugs and I am trying to find out what motorcraft spark plugs would be equivalent to Autolite copper #26 heat range?

 

I think I want to go with Motorcraft ASF42CA?

 

 

The chart shows that these would cross from Autolite 26.AF52
Motorcraft
AF52C
Motorcraft
ARF52
Motorcraft
ARF62
Motorcraft
ASF42C
Motorcraft
ASF52
Motorcraft
ASF52C
Motorcraft
ASF52C-7
Motorcraft
SP-425