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The 3.4 is the only swap that bolts right up. LS-1 and motors of that size require moving the fire wall and getting new mounts, computers, ect. Plus after all that power goes into, you'll pay the same amount of money on the install just trying to get traction. S-10's are fastest when they have moderate horsepower, I wish people would realize that. 400+hp is death in a dime.