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2× on above post. If you are worried about wear, keep the air cleaner changed too.

My daily driver has 14:1 compression ratio and runs great on 87 octane. It has a piston pockets, dual variable valve timing, header exhaust, electronic ignition, and direct fuel injection. It is loud for the first 5 seconds after starting due to fuel enrichment, then it sounds and runs great.

I have easily passed emissions with many older cars. I set ignition timing to about 14 degrees BTDC with vacuum advance connected. With car off check the idle screw settings. This is done by counting turns of each to fully in, small screw driver. Do not over tighten, it will deform the idle...

2x

In the instructions for 6000 RPM: At end of box set, rotary switch to 6 (arrow points to 6). The first small switch #1 next to the rotary should be down (as it was). The rotary switch is set by rotating with a very small screwdriver. Turn gently clock-wise. Since the lowest RPM limit is...