RNR Custom Engines is Arizona’s Premier Engine Builders, servicing the valley for 20 years. RNR Custom Engines offers a complete state of the art automotive machine shop. RNR Custom Engines is a family owner and operated business, we exceed factory OEM specifications. Their experience in drag racing, dirt track racing, off-road, marine, and diesel engine rebuilding excel our craftsmanship above all others. With our strong customer service RNR Custom Engines has formed strong lifelong relationships with our customers.