![]() He has been awarded the Street Limited Championship for both 20. The final result? They failed to break the engine, and that wasn’t the biggest surprise they got.ĭerek races in a heads up series in Denver Co. Then they would bolt it to a dyno and start adding boost until the engine came apart. Their plan take a stock block 5.3L junkyard engine, add a cam, Total Engine Airflow ported heads, a performance intake system, 75lb. Hot Rod tries to find out what it would take to grenade a 5.3L LS truck engine. Ted at CNC Racing Heads.Hot Rod Magazine’s article ‘Big Bang Theory’ I can keep writing, however feel free to call. Since you have a distinct “miss”….check the exhaust header tubes with a heat gun (or touch with a saliva coated finger )…) when running. from a lifter plunger issue to an exhaust flange gasket leak. When these heads are off, I Normally replace exhausts with a Manley or Ferrea valve. Since you don’t abuse the engine, I suggest looking other places. Yes the LS7’s have exhaust valve issues, they can drop, and I’ve fixed a ton of them. Check pushrod tips and rocker cups… they can take it hard sometimes. Check the valve spring ( they do break occasionally). If something is unusual, investigate further… check that the rocker bolt is torqued. Bring each rocker to the valve closed position to check, and try to push the rocker to force the lifter plungers to collapse. Once located, pull that valve cover and inspect the rocker arms, see if a rocker may have unusual lash or no preload. Prior to taking your cylinder heads off for a rebuild, I would get a mechanics stethoscope and pinpoint the noise location. The information listed here is for a stock engine. With these modifications, the LS7 can easily rev to 7,100 rpm. A high-capacity, dry sump oiling system.Block machining performed using deck plates to increase accuracy.Unique high-flow, CNC-ported, square port, cylinder heads and intake manifold.( Summit Racing’s Brian Nutter and Paul Spurlock contributed to this article.) Chevy LS7 Engine Specs Top-End Features You can explore all of our LS engine spec guides and LS tech resources here. This specific guide is for the GM LS7 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. It was purpose-built for high performance. It is unique because it was based on the C5-R Le Mans Corvette racing engine. The LS7 is the largest displacement engine in the LS family. It was available in GM’s high performance cars between 20. ![]()
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