Feb 21, 2014. #7. chricol said: Afaik the modern FIRE engine in the grande is an interference. The closer head will hit the valves. In fact the compression ratio is 11:1 in the 8v. james44422 said: I asked my mechanic when i had my timing belt done (1.4 8v FIRE) and he said it was an interference engine. Distribuzione Fiat Grande Punto 1.4 8v 77cv benzina 350A1000. Distribuzione Fiat Grande Punto 1.4 8v 77cv benzina 350A1000. xYNd0.