PURCHASE AT YOUR OWN RISK In 2023 I purchased a rebuilt Chevy 4.3L engine and had to use an "authorized installer" to install the engine because, unlike S&J Engines, jasper Engines will not allow competent customers to install their engines. As a result it cost me $2500 to install plus fluids. That engine lasted all of 16,000 miles before a head gasket failed and cost me a $6000 job I was supposed to start the following day. After getting the engine installed by an "authorized installer" who took two weeks to do a 1 1/2 day job because they couldn't use the web to find vacuum hose routing. As a result the installer took a hammer and chisel to the TBI throttle body then tried to pass it off as "good to go" when they hadn't driven it and brought the engine up to temp, because they knew it would code, which resulted in an improperly tightened trans cooler line coming loose and drenching my engine bay in trans fluid while going to a job. Japer Engines warranty is an insulting joke on trusting customers, when their "professionally built" engines fail. Had I, a very experienced mechanic, been able to do the install I would be OK with it. But unlike S&J Engines who trust their customers abilities to do the work themselves. Jasper demands you use an "official installer" of their engines. So as a result of Jasper Engines policies, Jaspers failed engine has cost me $10,000 in shop charges and lost work for my small business. Personally Jasper either needs to allow customers to install the engines or they should be responsible for all charges when their engines fail and customers are forced to use their "authorized installers" Date of experience: March 14, 2025 read more