heya pplz i was wondering are the L-series motor the ones in the 180b are they 6 or 4 cyl cusi was searching the trading post for datsuns and i saw an add for a 6 cyl 180b and it was in the nsw section if any one was interested

This is just a wild guess since what we got in the states wasn't called a 180B. I'm not sure what it was, I'm assuming it was the 610 here.
Anyway, deducing from Nissan's usual practice of naming cars for their dislacement in deciliters, why I'll never know, I'd guess that the 180B came with an L-18 four cylinder.
The one you saw in the ad might have been a conversion or a misprint. Or, I could have my head up my ass. Juan never knows.

180B come with L18, there's also version called 160B which come with L16. LHD-version model is PL610 and lovely hardtop version KPL610. I've got couple of those Hardtops( actually I have keep them all), two of them SSS versions. RHD vesions miss that L from their model name. That p represents L-series 4-cyl engine(L-engined 1200 is PB110). There's also 6-cylinder models, G610 KG610 called Bluebird-U 2000GT which has longer nose to make room for longer engine and keeping 50/50 weight ratio. 810 models with sixes were sold is US under Maxima name, though. That G represents L-series 6-cylinder as my C110 Skyline 240K-GT hardtop is KHLGC110.

Nissan mixes and matches their parts hardly in 70's, most models can have any engine from factory, for sixes noses are little longer and most middle-size models can also have either IRS or rigid rear axle.

And yes I love Datsun J-edged design, especially Hardtops.

Hy guys. I am the lucky owner of a rust free granny kept Datsun 610/180B.The previous owner had it kept in a roofed garage and took good care of it. In the US the 1973 610, first to appear, came out as a L18 engined car. Following year and up untill its discontinuance , the 610 came out with an L20B engine(as mine, which is a 74 L20B engined Datsun, IRS,hardtop(hatchback, I do not understand the designation "hardtop", as far as I know, there are no "soft-top" /convertible Datsun 610's(180B's)). The 6 cyl version is the longer front Datsun 810, perhaps the add you read made a mistake in writting the numbers 180 instead of 810. It could be an enthusiast installing a 6 cyl in that car too.
Check it out.
Jaime

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Convertible with removable hard roof is original Hardtop. Logically in this design there are no B-pillars and windows are also without frames. It was noone but Americans who started to call B-pillarless cars as hardtops.

Anyvway in here it's real chassis type name for Datsuns. As it read in registeration card as model name: 2d Sedan-120Y PL210 vs 2d Hardtop 180B SSS and 2d Hardtop-240K GT

"Hardtop" can mean several things. As naukkis said, generally in American cars it means the doors do not have frames around the windows and in a 4-dr there is no window post (b-pillar) between the front and rear door. If it has window frames, it's called a Sedan. But there are many exceptions. Chevy had something everybody calls a "hardtop post". My Subaru DL had no window frames, but I never heard it called a hardtop.

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Hardtop is always b-pillarless design. Even with 2-door design. Your Subaru just have frameless windows, it isn't hardtop.