We just completed a V-8 swap to a 1984 Fiero, and weighed the car before and after the swap. We removed the stock 4 cyl. Engine and replaced it with a 400+ HP 350 engine with cast iron heads and Alum. Intake manifold. Both times the car was weighed it had ½ tank of gas and all other conditions were the same. The “Before” weight was measured 07-04-99 and the car weighed 2620 lb. The “After” weight was measured 07-17-99 and the car weighed 2780 lb. The net gain for the V-8 swap was 160 lbs. Total! Here are some scans of the slips:
