This is a set of 4 gaskets, enough for one engine. Compatible with all LS engines. Hard to find and always in demand for LS Swappers--These Steam Vent Tube seals are direct replacement for the leaky, aged factory parts, or you can carry a spare set just in case...nothing ruins a race weekend like a coolant leak. Don't pay the high prices at the GM dealer! In stock with Free Shipping! Be sure to check out our other items for other great LS parts.