Are these Harley rocker boxes?

[sagefinds]

Thought these were shovelhead when I first got them but it doesn't look like they are. Appreciate any info.

[dustycrusty]

1957-'85   Iron Head Sportster

Edited June 19, 2020 by dustycrusty (see edit history)

[sagefinds]

Thanks DC,that sounds pretty definitive. Although in the picture,those have a dip in the outside center that mine don't have.

[dustycrusty]

6 hours ago, sagefinds said:

Thanks DC,that sounds pretty definitive. Although in the picture,those have a dip in the outside center that mine don't have.

ARGGH! you are absolutely right. The bike picture I used has a 1971 -'85  model engine. Your heads are of the  earlier 1957-'70 style.

 They'll all interchange,  but they are stylistically different

[sagefinds]

Thanks again,I'll take that as gospel.

[30DodgePanel]

Dusty knows his bikes... good call  

 

https://www.mecum.com/lots/LV0118-315371/1957-harley-davidson-sportster/

 

Performance wise any differences or is it all appearance ? 

I wouldn't think so but just asking...

 

I like the ole school look much better.

 

Edited June 20, 2020 by 30DodgePanel (see edit history)

[dustycrusty]

They are basically the same  although some had an issue with the castings being a bit thicker so you had to grind out the interior walls of the boxes a bit if you wanted to run higher lift cams. I cant remember if it was specific years in which this occurred or just an odd lot of castings that had that problem though, but yes, despite a few cosmetic changes all iron head rocker boxes will interchange from '57-'85.

 

HOWEVER,  there is a specific part for the  rear and another for the front head and while you can swap them easily from engine to engine, you cant put a rear box on your engine's front head or a front box on the rear head without some "creative" external oil line routing..... 

 

That '57 is perfect- hand signals and no worries about anything behind you!