i just got a little datto 1200 ute with a 13b bp they hammer ey awesome fun

12a n/a is the largest rotor u can put in ur 1200 i have a 1200 coupe with a twin dizzy 12a engineered and road worthy and registered just has to be done well, mine has had the seems stiched welded, larger rx4 transmission tunnel, bigger brakes

plus mine was done back in the late 80's to early 90's lol but yea isnt 2ltr capacity the largest for 1200's with the weigth ratio cause the rotor capcity is doubled by the rta cause has more pulses per rotation. so it infact is a 2280cc they class is as or something.

Mmm no offense intended.. You do a conversion like that and dont get it engineered chances are things will go wrong simply cause your doing the wrong thing. Have an accident they do the Homework your in the wrong your car aint legal your gone matey and rightly so in my opinion. Its a one way ticket to trouble. Think conversions are great but also believe we should be pointing members in the right direction especially when it comes to increasing a cars power in a big way and playin by the rules.

as people have said ask your engineer! some people may have first experience with some engineers like me and will tell you that there are people out their that will write up a report on nearly anything for the right amount.
in saying that tho cops Will defect you even with an engineer cert. if they want/your a dickhead
imo dont bother getting it engineered drive it sensibly on the street, dont draw too much attention to yourself and you should be rite

Big is good, bigger is better is a fair call...
but, I've seen Ange's 12A ute in action and it's no slouch on the street!
12A's are reasonably cheap too and there is no reason you can't stick a few pounds up it's arse after it's engineered. (your risk).
But... no harm in asking those engineers about the 13BT... What's the worse that could happen?

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That's why there's a thousand 1200 ute's running around with 350 chevs in 'em!!!

Not baggin' you out, technically what you say is right, but the cost and stresses one must go through to engineer such a conversion are prohibitive. Plus you'll have fun trying to find an engineer willing to spend the time and effort on such a conversion.

If you really are keen on the rotor conversion for street use stick with the 12a, should be no hassles.

EDIT: Dazza is spot on, best advice yet.

if you were serious you wouldnt be asking us.
ask you state RTA
if we say yes and were wrong your stuffed
you can download the DOTARS regulations from their site.these are national "guidelines"
this means your state may still say no
shoey has a link to it on his site
just because someone has done it in the past doesnt mean you still can
do your homework before spending any money

its not just nsw either qld and victoria have the same rules. 12a is the biggest rotary you can fit unless you create a full chassis for the ute

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whoever says that doesnt know any thing the only way you will know the truth is ring or meet up with a rta approved engineer and ask him yourself

This seems to be the age old question!

It's been asked a fair bit on this site. But, as far as i know, it all depends on the engineer.