obviously depends on the engine.. there are motors with stock heads and plasterboard (so to speak, of course) that is just a little and you crepano, however, die hard.. for example the tested alfa 147.. from the 115 120 150 hp are specular and are very lowresistence.. while those of the 140cv are beastly!
for proper mechanical operation, the advice is always to stay a cleat below the maximum engine speed.. then of course money is yours, you do what you want!![]()