Nailhead Buick question

Is 455 cu in from a 1973 a nailhead? From what I can find it appears that a 425 is the largest nailhead. Thanks in advance.

 

no that is a big block buick. last year for a nailhead was 66 or early 67

 

nope and yup

 

The 455 is a later model big block buick, the nailhead ceased production in 66-67.

 

FYI the "Nailhead" is easy to identify because the valve covers are vertical, not laid over at the cylinder angle. Also, the distributor is at the rear of the engine, not the front like the later Buicks.

 

The 425 was the last and biggest nailhead produced in 1966.... the dist is in the back of the engine on all nails...

 

Here is a nailhead.