NHRA Heritage JrFuel, & A/ND, B/ND Comp rules limit to CAST IRON only heads, you can use alum heads in everything else, except SouthWest Jrfuel Association, iron only.
ALSO NO NITRO in the about classes, alky only. Bracket dragster classes can run any nitro, alky, or gas, & of course blowers too.
I hope this clears up some of the confusion about JrFuel. You can find more info in the NHRA Comp elim A/ND, B/ND rules, and Heritage JrFuel rules.
There is ALWAYS talk about a real Nitro JrFuel class, and I have suggested, many times, that if anyone wanted to build a nitro JF car, they should and race it in 7.0 Pro, and when they have 10 cars/ teams then I'm sure we can talk Heritage into making nitro JF a class. We just need enough car count to make the Heritage tracks happy.
So, I say it again, BUILD IT, RACE IT , find a combination, and let me know so I can sell the class. Gary Adams, Gene Adam's, brother tried to put together a injected nitro class with the main idea of a cost limiting rule of only Vertex Mag, instead of fuel pump limit like Heritage A/FD. Big fuel pumps with out enough ign will limit the HP and costs. But no takers, Gary even had a race booked, but no cars showed except Kin Bates 6 time Heritage A/FD Champion, with a Vertex mag.
Included photo is my 1963-68, 301 ci 97% Nitro, all iron, high gear, smoke the tires till half track dragster. We won allot in the Midwest, ran speeds of 191 mph, in 64-68. And raced almost every week if there was no snow on the tracks, had a GREAT Time, back in the day.
Jon