Troubleshooting - Engine Replacement Confirmation
 

Troubleshooting - Seeking Engine Replacement Opinions

2004 Suburban 1500, 5.3L Flex Fuel Engine. 196K miles. Code 0300 and 0305 on the scanner. All cylinders verified spark, fuel, and compression at idle of 155PSI-160PSI. Leak down test in #5 cylinder is less than 5%.
#5 cylinder holding 35 PSI at open throttle. I believe this suggests a lower engine internal failure consisting of either rounded cam lobe or faulty or sticky push rod. Planning to replace the engine with a long block unless the Forum has other suggestions. Am I missing something? Any experience with re manufactured engine company's is also appreciated. Thanks to the Forum!