How can you tell the difference between and early 3dr head, 2wd head and a 4x4 head? Or does anyone know the part numbers of all three so I can compare?

 

bttt

 

4x4 and 2wd are easy to spot

4x4 dont have a big lug on the exhaust side

No idea on how to tell early and late 2wd heads

Steve

 

The size of the machined hole where the bolt/washer goes down is the clue, 3 door ones are MUCH smaller diameter, sapphy 2wd are larger, by around 6mm.
A few very last 3 door had "uprated" heads, ie the larger washer type fitted from new, as did some warranty claim heads on 3 doors.
When roosie got 200 block studded and we fitted the 2wd head we could not find a socket that fitted the nuts that would actually go in the hole, so I ended up machining the socket down, assume this was an early head but didn't measure.
tabetha

 

doesnt matter what head you use with a long stud kit,you would have to make a socket fit..the early 3 door heads only had a 2 bolt thermostate housing instead of 3 bolt..early 2wd heads had a dowel on the inlet ports where the inlet plenum bolts up..everyone thinks thats just rs500 heads but its not..also some 1988 saphs have some early 3 door engines..cheers danny