just use all coolent and u should be fine

I didn't know all of them were alloy, my bad lol. thats just what he told me, that he was putting an aluminium head on it

it should be fine i

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

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

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?

All nissan/datsun A-series have alloy heads.

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

the head on my 78 a14 is alluminum aswell.

i think you will find that a12s
are all aluminium

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.