cylinder heads

[JP]

Turbo valves are sodium filled and with regards to cracking its hit and miss. I've had all casting numbers where I've had to Weld the chambers and replace the seats because were so bad the seats could drop out. And I've had all of the casting numbers were a small 30 degree cut gets rid of any cracking or there were none at all. All comes down to casting flaws and whether there was any air leaks on the car during its lifetime.

[newsh]

And NA heads have same size but different valves? Are the turbo valves sodium filled?

[driftin jo]

Yes, Apart from the water manifold holes that you have to machine, they are a bit less the same with that taken into account but have had an easy stress free life and not cracked like all the turbo heads.

[porkkis]

Essentially the naturally aspirated heads are the same too. But they're not if asked are they te same or not.

[driftin jo]

No. Early AAN and all 3B heads lack the hall sender holder.

Yes, but you can use the tuna can hall sender or just weld / drill, tap and bolt a bracket on for the front pulley type hall sender, so essentially they are the same.

[porkkis]

No. Early AAN and all 3B heads lack the hall sender holder.

[driftin jo]

Yes

[audinut]

Are all these ,AAN,3B,ABY,ADU - running the same cylinder head?