If you have the A15 intake manifold with water heat I would use it. Drill the water passages in the head and hook up the return from the manifold to the heater return.

Without manifold heat the car will not run as smooth or be as responsive at low rpm. As an example, I have 2 1200's, one has the stock exhaust manifold with the warm air induction working, the other has an extractor and does not have either manifold heat or warm air. Both cars are running modified and re-jetted stock Hitachi carbs. The car with the extractor had to be jetted richer on the primary to run correctly and even at that, it's not as responsive or smooth and does not pull from low rpm as well as the car with manifold heat and warm air. Also, the car with the extractor gets lower gas millage, 28 mpg VS. 32 in mixed driving.

What if i put the whole set of A15 head in the A14 block? Will the compression drop? How do i drill the head? how deep?

Hey Bandit,

Depeding on the format of the head- you may gain or drop the compression. The A15 head will go on the A14.

Are you looking to gain/increase your compression ratio?

Here is some helpful info from the wiki, by the sounds of things you are looking at increasing the compression (higher compression ratio). Have a good look at the heads you have as one of them might have the the smaller peanut shaped combustion chamber, these heads are a good basis to begin a high comp arrangement. You could begin with a surface grind of the head underside to further decrease the combustion chamber volume?

Maybe take some pictures of the different heads?






A,B: Heart-shaped high-compression chamber is good for high-octane gasoline
a.k.a: closed chamber, peanut-shaped, butterfly-shaped or kidney-shaped.

C: 360 degree open chamber low-compression is good for regular-octane gasoline.

D: Bathtub chamber (from swirl port head)?


A Series Heads

Thanks Clyons8, i will see what i got here and then decide what to do. I don`t want to gain compreession, just don`t want to loose what i have with a standard A14 head. I need to find a way to warm up the fuel, with the exhaust or with the water jackets!

How does this heater plate manifold differ from the flap type?
I'm a little wary of getting a flap type for my friends ute as I heard the flap opening gets fouled with carbon.. just wondering if this heater plate type was a better setup?

so for my understanding.. there were 3 types of exhaust manifold produced?

1. The flap type
2. The heater plate type?
3. the water flow type?

I am not aware of any exhaust manifold that has any water flowing through it....

Benny is right
The point is to heat the intake. The exhaust is already heated