NGK 4291 ZFR6F-11 V-Power spark plug vs ACDelco 41-993 professional iridium spark plug

Both options make for good, if unremarkable, Spark Plugs at the $4 budget range. While they should serve reasonably well, you might want to look into some other options at that price point.

If you're still interested in learning more about the NGK 4291 ZFR6F-11 V-Power spark plug and ACDelco 41-993 professional iridium spark plug, however, we wrote-up what we know about them:

The NGK 4291 ZFR6F-11 V-Power spark plug hasn't managed to perform well enough to earn a place in any Spark Plug roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.

Taking a look at the ACDelco 41-993 professional iridium spark plug, we found that it hasn't managed to perform well enough to earn a spot in any Spark Plug roundups done by sources that conduct their own, high-quality, hands-on testing. That alone makes it difficult to recommend.

As a last step, we wanted to do a head-to-head NGK 4291 ZFR6F-11 V-Power spark plug vs. ACDelco 41-993 professional iridium spark plug comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.