The NHRA rule book said that the Fuel engine was based on the Chrysler Hemi...that was removed from the rule book....but the specs for the engine remained based on the chrysler Hemi...so you can build whatever you want ...put whatever decals on the valve covers...but it is still a Chrysler hemi...
changing main bearing size was or is probably one of the few things you can do....the deck height...cam tunnel height...cylinder head valve angles...blah..blah...are all based on the 426...
