my car is a 78 b210 with an a14. i already went through the tech section, but since i have never had my head off i cant tell. i did find a couple pic i can compared to my head. one i highlighted a plastic fitting that mine doesn't have. isntead mine has a removable metal plu. what is this?

in the other points out where mine HAS mounting holes unlike the pic. the pics wouldn't work on here so i uploaded them and made links below. does anyone know what kind of head i have?

mounting holes

fitting

anybody?

if you take the valve cover off, there will be some casting #'s those can help.

so you have a 1978 A14 MPG b210?

from the tech section...
A14 could have several different ones, such as G32, H72 (or 728), H74, H75, H77, H78, H85, H92 or H98 depending upon year, country, and emission control design.

A14 Oval-port "H72" head
Intake: 37mm
Exhaust: 30mm
Somtimes called the "low compression GX head", it has a casting number "H72". Has a larger 360 degree "open" combustion chamber for lower compression ratios. It does not have the coolant holes below the intake ports. The H72 head was common around 1977-1978. This H72 head is basically the same as the Nissan competition GX head, but it has a lower compression combustion chamber, and the same regular size valves as any other A-series head. It has the nice straight big oval intake ports. It is better than the A15 oval "swirl port" head, and certainly better than the round intake port A14 heads. EGR port in the exhaust ports. These can be milled .080" or more to raise compression.

So is Oval-port "H72" a good head or not? Naukkis says the high-compression head is a better design, and not just because of the compression (see New A series oval port head). The best combo for low compression would undoubtedly be a high-compression head used with half-dished pistons (half-flat-top, half dish), but are these available for the A-type engines?


I'm guessing it's a better head than was available in the 80's.

There aren't any external oil passages on those heads, those are for the fuel rail thingie.

i know the mount holes mount the "feul rail thingy" . i still dont know what the plug is

I think that port at the back of the head is the coolant return from the heater. people plug it instead of bypassing the heater and it's been rumored to cause hot spots that are bad for the engine.

ah, last night when i was getting frustrated with not getting anywhere with my vin search i went and looked over my car with a flashlight and wrote down all the numbers i could find. now im looking at the paper and i wrote down "H7206" and "A14F" so i probly have the h72 head. awsome. thats what i wanted to know. thanks sleeper.

the plug im refering too is in the front drivers side of the engine, just in front of the manifolds assembolies

actually looking at that second picture, you mean the other thing... I'm not sure what that is. it's probably still something related to the cooling system.

i figured so.

The car is H72x, but that doesn't mean the head is. However, most B210s A14s are large oval, the round ports were found in the 5-speed coupes.

A14F? now that's interesting.