can anyone tell me the difference between an cossie 2wd & 4x4 head? been told ive got an 4x4 head but not sure!

 

turbo oil feed is between cylinders 2 and 3 on a 4wd

 

The 4x4 head does not have a cast block over the exhaust side for the turbo damper.

Steve

 

As above and the 4wd head has 3 bolts for thermostat housing, it also has different shape holes for the water, in that it has holes as opposed to long slits of the 2wd, in essence it is superior.
tabetha

 

hi tabetha, from memory i think you will find that only early 2wd heads(3 door) had two bolt holes for the thermostat and the later 2wd(saph) had three.
I will need to check some heads in my workshop to confrim this though.

 

Just going by my car, which is a 88 sapph, which defo has two holes.
tabetha

 

ie, a 4x4 head is not made of chocolate.

 

well it seems i have a 2wd head, the thermostat housing has 2 bolts. The b--ted lied to me!!!!!!!!!

 

Check the part number on the front - that's more definitive.

2wd (86 - 89/90): V86 HF 6090 AA
4x4 (90 - 92): V89 HF 6090 AAh

 

All 4wd have 3 holes, the rejigged thermostat housing was one of the improvements made, for faster warm up times(heater).
tabetha

 

2wd late spec heads look like this on the water jackets, and have 3 holes for thermostat

 

Something else I've learnt.
tabetha

 

Well im amazed! so only by taking it apart i can tell, right???

By the way cossieDavedree that engine looking sweat man!!!!!

Who done the engine work for yah?!!

 

Thats saved me going up my workshop to take pictures cheers!!!

 

thanks I did all the work myself, bar the cam cover, which was already done when i bought the car.


As people have said on here,, You can check the part number on the front of the head,
3 bolt thermostat and turbo damper lugs not present would more likely be a 4x4 head.

Theres also a difference in combustion chamber volume between a 4x4 head and 2wd.

Good luck fella.

 

This is interesting, my 1989 2wd saphire has three bolts for the thermostat housing, but has the older style wide slits for the waterway rather than the three holes in the head below.