Another plug question...
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Cross-Country
Joined: Oct 2022
Posts: 59
Likes: 1
Another plug question...
For those of you with the 4.9 and msd 6a - probably an upgraded coil as well - what plug are you using? The narrative on the msd website suggests a "cooler" plug if you are using their product, but I don't have any tangible ideas as to what a cooler plug would be.
Lead Driver
Joined: Jun 2021
Posts: 5,221
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MSD coil is not going to do you anything good. an OEM v8 coil (like a junkyard) or new one from ford if you can still find one will be 100% better than an MSD one. it can tolerate plat/iridium if youd like more miles on a plug but copper goives you the most juice but you need to gap and replace them earlier in life
Hotshot
Joined: Jul 2020
Posts: 10,519
Likes: 2,654
From: Near Salt Lake City
BRF 52
BRF 62
BRF 32
The 32 is colder than the 52 or 62
So, a 69 Z-28 takes a R43 AC Delco plug
A 75 Corvette takes a R45
The hotrod motors get a colder plug
MSD is assuming you upped the compression and have a modified High Performance engine
I think you are fine with the factory plug
Those 4.9's used to "blister" plugs anyway (because the ignition system worked so well) (hint)
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