![]() Will a set of 4.8 flat top pistons make up the difference in lost compression? Any other advice or suggestions are welcome. Is it gonna start or will I have to have the ECU reprogramed? 3 Will I need to obtain a stall torque converter, and finally 4 Ive come across a set of H beam rods but there only 6 inch. 2 im putting this back into an 02 avalanche. 1 will the cam gear mate up with the crank as I want it to with conventional instalation? Ive heard that the two have different amounts of teeth and have been told I need to change the crank. so now i have to re do the 50 hours of hand to head work on the set of 862s i collected. Unfortunately I ported and polished the 706 cast heads before I learned of their suseptability for cracking. I am doing a cam delete plate moving the cam sensor to the front and putting in a custom cut zo6 cam with a single bolt cam gear. ( Summit Racing’s Paul Spurlock and Brian Nutter contributed to this article.) GM LM7 Engine Specs This specific guide is for the Chevy LM7 LS truck engine. Summit Racing has created a series of comprehensive guides for each engine in the LS family, so engine builders and tuners can have a handy reference for their projects. The aftermarket is strong, crate engines are available, and used motors are often cheaply sourced through junkyards. These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide. Since LS and Vortec engines are so common, they’ve become the go-to performance and swap engines of the modern era. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick-heck, even Saab, Hummer, and Isuzu got some LS love. The information listed here is for the stock LM7 engine. For marketing purposes, it was also known as the Vortec 5300. 3 small block engine used in GM trucks between 19.
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