http://www.carzi.com/2008/08/08/toy-jet-worldss-first-ls1-porsche-911-conversion/
“Weight of LS1 engine -vs- the Porsche 3.0 stock engine: 56 lbs. lighter”
“The porsche 911 equipped with the LS1 conversion and Toy-Jet cooling system installation yields a
combined weight savings of 21 pounds lighter at the rear of the vehicle!!!”