Trump has signed an executive order expanding red-dyed diesel use through December 2026. But tax deferrals, state restrictions and diesel supply shortages could limit the savings for truckers and pickup owners.
Before installing the cylinder heads, check the LS1 block deck for warpage. Our LS engine reference specifies maximum flatness of 0.004 inch within 6 inches and 0.008 inch across the deck.
If there’s one engine family that completely rewrote the rules for affordable horsepower, reliability, and aftermarket support, it’s the GM LS engine...