Antifreeze/corrosion inhibitor

[Dellb]

Hi All
You may remember my thread about the abnormally high CR on my 1980 C3 with the 400 SBC engine. I have just taken delivery of two lovely Edelbrock alloy heads with 70cc chambers that will bring it down to 10.7:1.
My question is: What anti freeze/corrosion inhibitor do you put in iron blocks with alloy heads?
Delb

 

[Roscobbc]

Important with alloy heads to use 'Old school' Glycol type anti-freeze in a 50/50 mixture with De-Ionised water. Prestone 'yellow' is a brand I last used.

 

[langlj00]

Important with alloy heads to use 'Old school' Glycol type anti-freeze in a 50/50 mixture with De-Ionised water. Prestone 'yellow' is a brand I last used.

Agreed Glycol for mixed Iron Block with Aluminium Radiator.
I just brought some from Euro Car Parts (Triple QX Blue Antifreeze)