Hey Everyone,
This update fixes some bugs and adds a 2jz-style engine which can be bought from the junkyard and mounted in either the Diamondback or the Eagle(car). It can be found in the junkyard, but it's expensive and will come with a few random broken parts. Jimmy Junks won't be able to help you fix it, so you'll have to fix it yourself. But the good news is it should be about as powerful as the stock V8. Replacement parts can be found at New Age. The car's original generic engine now wears out over time, but you can buy complete generic engines at the junkyard for around $250 if you would rather use those in your car.
This update should work fine with your old saves, though you might need to recalibrate your mouse sensitivity settings this time. If you have an extremely old save it might be a good idea to start a new game if you notice any blatant anomalies.

Patch Notes:

Added a six cylinder 2jz style engine. This engine works in both the Diamondback and the car. The engine can be bought in the junkyard.
The car's default engine will now wear out over time.
Cheap replacement engines can be bought in the junkyard for around $250.
Auto parts store now has i6 replacement parts.
Jiggs Casey can now recover the i6 engine once it's bought.
Added a sheriff's office/jail. This is part of the next update.
Iron ore now gets destroyed if it falls out of the world.
Moved the i4 engine mount bolts on the diamondback to make them easier to see.
Fixed an issue with mouse sensitivity changing when viewing the menu for the fist time.
Fixed an issue with blackberries not saving properly.
Fixed 3D sound issues with vehicle engines.
Fixed an issue where car's oil level had an inverse effect on the car's power.
Fixed an issue which could cause some items to be thrown out of inventory on loading the game.
Fixed an issue with an Exit Vehicle tooltab appearing when vehicle hasn't been entered.
Fixed an issue with the Diamondback's interior being clean when first bought.
Fixed an issue where engines could come lose from the motor mounts without being unbolted.
Various terrain fixes and clean up.

I'll have another update for you soon which adds an antagonist character to the game and makes use of the Sheriff's station.

Thank You,
Keystone