Originally Posted By rowin4
I have the World block with screw in plugs, does anyone make screw in heaters?



Not sure about the screw in but I would give Jegs a call


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time