Thats a good idea. thanks for that

with your exhaust, if you can get a new flange that suits the orig manifold, upsize the main engine pipe to 2" with a single sports muffler. if you cant get a new flange have the exhaust cut a couple inches below the orig flange and go from there, the A series engines love to have lots of air go in and out the faster you can get this happening the faster you can get the engine to go.
even with the stock carby you'll notice a big improvement in the rev range

Having a read through the tech sections and old post here and I have a question. What do you think about using a standard A15 exhaust manifold on the a12 head with a 32\36 webber? It's already on there but I want to know if it's worth the "budget" to get a 1 3/4 inch pipe mated up to it with plans to uprage it later.

manifold

Well the problem with this thread is that the Maz HASN'T FILLED IN HIS LOCATION

Swirl port heads may be exclusive to U.S.

If you're in Pakistan, you may not even get the A15.

Would the a15 head cause a compression loss on the a12?

We have heaps of A15 heads laying around none of them are swirl design??????????????

they flow heaps more then A12 standard head

the swirl design A15s i have never seen so hunt around and check the ports

Will a stock A15 head flow better than a stock A12 head? I'm not sure. It's got bigger valves, larger intake ports, but they are swirl design.

i'll tell ya why...

A12s are throwaway. blow one up and no-ones gonna cry. that also makes them cheap to modify. i have 1 in my shed i plan to turbo at a later datre

add to that there are no licensing issues turboing an A12 in a 1000 or the like.

class regs for under 2L stipulate that a turbo A14 is out of the question (1.7x NA capacity), but a turbo A12 comes in at 1990ish cc.

so there are plenty of good reasons to do up an A12. it's like picking an RB26 over an RB30 - one revs harder.

i know which one i'd pick.

From what I heard and saw,putting an A15 head on an A12 along with webers,even a15 pistons etc can increase the performance of the A12....but why waste time doing up an A12 when you can get an A15(with manual gearbox),ca18det,Z18T or SR20.....I wouldn't

I have a 1977 120Y (B210), that is my farm hack, as an auto it was gutless!, but I found a hotdog/cherrybomb muffler in the shed, where the engine pipe flattens out to go under the car I cut off about half a metre back from there and put the hotdog/cherrybomb in the "cavity" under the passengers seat as an auto top speed went from 75 Km/h to 100 Km/h but now that it is a manual it goes VERY well now! also because my 120Y isn't road worthy I did some things that you might not get away with on a road car like removing hoodlining, carpet, all the "interior plastic crap", heater(it may go back in though!)

I wouldn't copy my exhaust sytem exactly just get rid of the stock muffler.