Picked up a Buick Nailhead 425 for the truck

[kwmech]

I personally think they're overrated if you want any type of real performance out of them. For the amount of work converting it into the truck, you can get more bang for the buck using a 455. Small block chevy valves are larges than those tiny things. Yeah they're torqey, but only up to about 4k then they fall flat on power. I think it's more of bragging rights having a funny looking engine in the compartment than anything