What is the Best Nailhead Engine for You?

What is the Best Nailhead Engine for You?

There are many different size Nailhead's, there are pro's and con's and we will go over most them.  The 401-425's are 3/4" wider than the 264-322's and 3/8" wider than the 364. The 264-322 is about a 1/4 shorter than the 364-401-425. They are pretty close in size but as the engines got larger, the decks got taller and the engines wider. Even though the 364-401-425 is wider, it's not at the bell housing, the 264-322 1" wider there. The 401-425 engines weigh about 620 lbs. The 401 and 425 have the most power but also harder to keep as cool as the 264-322-364. If building an early car with a small radiator and closed hood the smaller engines run the coolest and the best choice. The 264 is a great engine for a light weight car, the 425 is going to give the most torque for heavy cars and trucks and for towing. The 364-401-425 have new flywheels and bell housings available, the 264-322 have only used available. Chevy automatic transmission adapters are available for all Nailhead's The 64-66 ST400 trans from a 401-425 will bolt to all 1957-1963 blocks, will not bolt to 264-322 blocks. This information should help you decide what works for best you.