360 OILING

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You are tubing the block and running solids.
The crossover is for when you run hydraulic lifters.
Besides that Duster of yours is carrying the front wheels half way down the track. Why would you even need oil pressure when your splash lubing your engine. Just kidding love your car.
You could also be running one of the new generation of bushed or needle bearing axle pressurized roller lifters. You need a wet system for these now too. I am trying the new comp cams sportsman roller lifter with the bronze bushing option.
I hope my dart runs like Pittsburg racers duster does. That thing hauls.