Meet the hidden gem that helped start the LS-swap craze. The LM7 (along with its L59 FlexFuel E85-capable brother) are the Gen. III, 5.3L iron block truck engines you can pick up in wrecking yards for about $600. There were a … See more These engines started life in GM trucks, but there’s just as much of a chance today that you’ll spot them under the hood of a turbocharged drag car. This article is focused on the power-adder pathway for upgrading the LM7, … See more In general, most LM7 owners will add boost or nitrous before they begin serious cylinder head work. Before we get into the power adders, there are a couple of things to address. 1. A 4 … See more If you only do one thing to the engine, make it a cam swap. The tiny 191 at .050-inch cam really held these engines back. An LS3 or LS9 cam makes good power, but not where you want it, if the engine remains in a truck. … See more The factory LM7 injectors were only rated at 22-25 lbs. and won’t support much more than 380 hp. Plan on upgrading to larger fuel injectorsto meet the fuel demands of increased power. Custom tuning will be required … See more WebJun 28, 2024 · Then I came across a site called Speed Engineering and they have a set of stainless steel long tubes 1 7/8 primaries and 3 inch collectors. The price is almost too good to be true at $289.99. For those who need to see to believe... Just curious to know if anyone has used these.
TSP longtube headers & magnaflow catback 5.3L - YouTube
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Ultimate Headers’ LS Engine Long Tube Header Testing
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