I don't think I'd miss indoor cement racing , there was only one indoor cement race in Sydney/Australia bitd , my brother & I had just gotten into BMX riding & went in to see what BMX racing was all about , the jumps looked lame , the track was predictably flat & the venue was cramped or undersized compared to the outside dirt tracks that were springing up in the burbs.
Outdoor cement skatepark insanity was our preferred option here in Oz , waay back then.
Don't know about Bart slamming or not in the B&W race shot , Jeff looks like he was in a good position to run the speed bump over if he did. Scuse the short jokes , when Bart, Gary Hassehurst (?) & D Young visited Oz under the JMC banner , they stayed at my sponsors house so our paths crossed a lot , being 14 at the time I found it amusing that I stood taller than Bart, Bart didn't appreciate my sense of humor which didn't help international relations at the time. The un amusing part was when I watched Bart race in the 20inch Pro class , he was on the pedals legs spinning like a demon yet his upper body was riding silky smooth , stable & _very_ fast , kinda like a swan on amphetamines.
Rambling along.....James Cassimus always took/printed great photo's for Action Now magazine
Feb 1981 issue of AN magazine.
Kos on the job completely focussed.

NBA Grand Nationals
Long Beach Veterans Memorial Stadium.
outdoor dirt , 1650 entrants.
Cool article & pix as usual , no mention of who won the cruiser division..
Jeff ???
JB