I've owned a 1971 Mach 1 Mustang 351C 4V for 20 years now and have dealt with overheating and high temps that long. The water restrictor plate seems to have taken care of the high temps. Even after shutting the engine down to heat soak it cools readily when restarted. The restrictor plate it a little tricky to install but if time is taken, it fits like the original part. If you are driving a 351C powered Ford I highly recommend this part! Thanks West Coast Classic Cougar!