Hey just wondering, I got my A12 in my ute rebuilt after it #### itself and the bloke that did it put an aluminium head on it he had lying around. I just wanted to know, whats the advantage of an aluminium head? Just a weight decrease or is there a power advantage?

the one he took off wasnt aluminum?

Another advantage of aluminum heads is that they conduct heat better, and so can often use 1/2 point compression on the same fuel as compared to iron heads.

i think you will find that a12s
are all aluminium

the head on my 78 a14 is alluminum aswell.

All nissan/datsun A-series have alloy heads.

J-series and pommy variants of this engine had cast iron heads.

can i ask wat the consequences of not using a lead substitute on an aluminium head will be.? will the exhaust valves burn out or somthin?

nearly all modern cars now have aluminium heads they all have hardened valve seats so there is no problem with unleaded fuel

i run optimax and never squirt any in. this will b ok u reckon?

it should be fine i