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If the car "runs away" on a hill the engine will be "running" (no ignition, but it will be spinning if the car is in gear), and if you have it in first and the car is going backwards ... the oil pump is scavenging oil from the engine, not feeding it oil pressure. Though, by the time the car stops, the least of your worries might be the condition of the engine
The oil pump doesn't "scavenge", it's lever rides on a lobe and pumps the same whether forward or backward. As stated, that's the least of your worries if your car is rolling down a hill and you're not in it.
The oil pump doesn't "scavenge", it's lever rides on a lobe and pumps the same whether forward or backward. As stated, that's the least of your worries if your car is rolling down a hill and you're not in it.
No, this is not your Fathers' small block.
LS1's have a gerator-type pump. It sits on the end of the crank, right behind the harmonic balancer / pulley.
It does indeed turn backwards if the motor spins that way, but as you've indicated, that's the least of your worries when the cr*py parking brake doesn't hold the car.