Not easy to get ahold of someone. Ive listened to tough to get response with warranty repairs. I do think they place out a very good products while. Just really have to discuss & obtain a new engine. Vendor responded rapidly and refunded $fifty to the bolts. Professional suggestion: Double-Check https://elevemotors.com/product/chevrolet-gmc-avalanche-silverado-suburban-engine-5-3-v8/