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Pure ethanol can be as high as 113 octane, and gas is rather low. The additives to gasoline bring it up, but they're using ethanol to do that in place of other additives. We use the (ron+mon)/2 method, so perhaps ethanol has a much higher ron rating than other additives, thus goosing the...

The 383 in my Charger has pistons .140" down. Something like 7.3:1 compression. Think I found why my car's a gutless turd.

What's the build date stamped on the motor?

The car is one unit. You adjust one corner, the opposite moves in the other direction. Sounds like you already have it figured out.

Engine assembly dates have been observed being after the SPD, too.

1/4" difference along a 15" rim equals 1° of camber. Caster is measured by the change in camber when you turn the steering wheel. There is a formula, but if you just want caster equal side to side, just turn the wheel to the left, measure the left wheel the way you have been, turn it right the...

A lot of people can't get more than +1° caster, so when people say get as much caster as you can, it's because it's impossible to get too much with the way our cars were designed. A new Charger, for instance, specs at 9° ±1° caster. So tell us what should the caster be, and what determines...

I think they call that lobe intensity. Regardless of the lifter type, a cam lobe can have a faster or slower rate of lift, and I think one can get an idea of how fast or slow that is by comparing the advertised and @.050" duration values, with less difference indicating a faster, or higher...

Do you know how to convert your measurement into camber angle?

So more positive caster, leaning the tires away from the turn, pushing the tread of both tires into it, is good, right?

What I'm wondering is how can a couple ten thousandths of an inch matter when the cam companies call out for the same valve spring for several different cams, with different durations, and different valve lifts. I also want to know if anyone uses the valve springs that come with new heads, or...

The car has more grip with the tires leaning into the turn, countering the vehicle leaning out of the turn, but it makes it harder for me to steer, and very hard to park. I drove a stock height, tire, and aligned Roadrunner once. It was so easy to steer at a complete stop. I knew it wasn't...

I understand that a racecar wants to have the softest suspension they can get away with exactly for the reasons you mention, and stiffening one end or the other usually reduces grip on that end, but other constraints often force one to have to increase roll stiffness. From the looks of how...

My lowered '69 Dart with manual steering, and as much caster with stock parts as possible, you can really feel the jacking effect on self centering. You can see the front of the car lift, and feel it in the steering wheel. The steering wheel would snap back to center so fast it was a blur...

The shorter upper control arms also induce dynamic camber gain under compression, but it also goes the wrong direction under jounce, so the inner tire is dragging the inside of the tread through the turn. Watching the road tests from the '60s, though, the cars had so much body roll, it looked...

Those are the good blades, but the ones they make now are crap. They're not stainless, but silver painted steel, and the clip is grey plastic. Refills are hard to find, or nonexistent, too, so save your old ones, and try to find refills. I hear big rig truck places sell refills by the foot...

Same here. It would pull the spring towards the rocker shaft instead of straight down.

How about this setup? Mopar Action Oct 2021 article re: swapping b body sway bar links with those from a recent Pford pickup for improved handling.

Mine started doing this. Just unbolted them, wire brushed the sliding surfaces, a tiny bit of silicone brake grease, and bolt back together. Problem solved.

I've see several people test various modern lifters against decades old NOS, and they're the same as far as hardness. Machining, however, a different story. A number of lifters were surfaced very poorly, wrong angles, and inconsistent surface. I used to regrind lifters just out of highschool...