It's SOP to inspect & gap new spark plugs to your desired gap before installing them. They could have been dropped, thereby changing the gap, etc. NEVER assume they are gapped correctly out of the box. How does the manufacturer know what YOU are going to gap them at?
Spark plug gapping may sound like one of those old-timey chores, like setting breaker points in a distributor or lubricating the frame, but having the proper spark plugs and ensuring they're properly ...
In olden times, part of the ritual of changing your engine's spark plugs was making sure that the gap was set correctly for optimum performance. That is, the distance between the spark plug's center ...
Following the instructions in the workshop manual, I set the gap on the lower two metal "pegs" that face the magnets. However, this left the top peg with a huge gap and I couldn't get a spark. The old coil was a Swedish made part (SEM) and all three pegs had more or less the same gap once the lower two were set. It was marked 544 04 70-03.
The plug gap is a little small for that mild of a motor. I would run @ 0.045"-0.050". In fact when I first started running MSD ignitions. It was a 6al box with a pro-billet dist. an a 350 built up not much more than yours, and I ran a 0.045" plug gap for 3 yrs. I think the example from MSD below is a little wide in my opinion.
Choosing the right spark plug and maintaining it properly can make all the difference in your engine’s health, efficiency, and performance. From selecting the right material to ensuring the perfect ...