If your goal is to make power above 6,000 rpm, a round-port is not the cylinder head you want.

You can port the heads with air passages. Cleaning up the bowl area around the valve stem will enhance the 2,000-4,500 rpm range.

yes the ports are round just like a std a12 head.

the rev needle at 6000 rpm.

i haveasked if i can port the head because this head has the air galleries to exaust manifold.

Any head can be ported. Just use a dremel tool and some sandpaper...it doesn't cost much.

The head you describe has larger valves than a GX head. I suppose the ports are smaller though. Did you say they are round ports? See valve sizes chart

and where was the rev needle sitting?!?

Ahahahahahhh...

this engine is runnig well,and is on my 120y.

the engine you are talking is the gx, that im buiding, is almost there.



this photo was taken today.

I think it can be "ported" if you want to spend some

the valves intake 37mm
exauste 30mm

can this head be ported like the gx one?

To correct what I said last year, there are two engines for USA in 1977:
- Regular, oval port A14
- Five-speed cars: Round port A14

Yours may be the 1977 round-port, or it may simply have had the head replaced at some time in the last 30 years.

The round-port is an excellent cylinder head for 4500 rpm or less operation. It got up to 50 mpg on highway with 5-speed.


See the pics for "A14 Round-port High-Swirl head" in the Cylinder Heads. Note that this is not about the "swirl-port" head which came later, but is the "high swirl" head.Quote:

hi there

the combustion chamber of this head is just like the gx one.

i will post a photo later.

see ya