It's also the spacing of the tread grooves. Mostly they are unequal and random in size - this reduces drone on the highway. Hard to see if yours have different sizes.
KD have you tried different tires to reduce "road" noise?
That's why they invented loud mufflers and stereos!Ah, the dreaded road noise!...
This is an irritation I have as well. In reality, the car rolls back almost nothing, but it is still annoying to have someone very close to your back bumper. Now, when I come to a stop on a hill and someone else is right behind me, I let my car roll backwards just a little bit as the other driver is stopping. I have found it keeps them further away most of the time...I've found that most drivers that line up behind me at stop lights don't even consider the possibility that this car might have a manual transmission and IF I'm on a hill, I might roll back a bit on take-off.
I think it would had been easier to have the adapter threaded, and the bolts going from inside the car into the engine compartment.The clutch master cylinder is a Wilwood unit with an adapter to fit the Mopar floor.
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It would be great to just place it against the firewall and drill. This not possible with the engine in place and those two right side holes are right up against the wheelwell anyway.
Oh, the lower left bolt?
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Trapped under the body of the master cylinder. You can't just set it against the firewall. You have to remove the adapter and separate the two, then get the bolt out.
I attached the clutch pushrod....
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