The 180B SSS was sold in Australia with three diferent induction systems i believe.
Twin Hitachi round tops
Twin Hitachi square tops
Single Hitachi downdraught.
Just which head went with which induction is beyond me.

I think that you're right, it's the heads casting number that makes all the diference, but i seem to remember reading somewhere that the ports on the L20b head were as good as any, so maybee it's in the combustion chamber that the power lies.

Ahhh what do i know when it comes to L series, i guess that Feral would be one of the blokes who would know for sure what the hot setup was. The only thing that i knew was that there was only one L20b head used in Australian models, SSS or otherwise. Just compare the valve sizes of the SSS head against the L20b's head.

If your guards & bonnet are shot, then have a look at the new Malasian made front sheetmetal parts that are available from Wetheril Park Panels. They may possibly prove to be a proposition, & if you like the coupe grille, as used on utes in '74 & '75, then they have new ones of these too.
Guards $65 [each]
Bonnet $110
Grille $40

yeah i know, its takin ####in ages to get to this stage, but u notice the shed thats in? yeah blame dad for taking his sweet ass time in building it! let the MAHEM Begin.!!
Oh yeah, i got a L20b for it too, 40 thou over bore, new pistons ( not forgies :'() balanced crank, shotpeened rods.
i got a whole 200b sittin up the back yard for parts for the L20b.
im doing a swap with a bloke, for a SSS l20b head.
just needs a cam.
I got a single 45mm sidedraught delorto for it too. on a lynx manifold.
should be a little rip snorta once i get it going. i just wana see the look on my mates faces when i take em for a drive, there always givin me #### bout having a ####ty old datsun with rust and no steering wheel or seats. IDIOTS I TELL YOU!,
enough dribble from me, im gunna go wipe my chin
woodydat