[Boomyal]

....a coolant recovery system.

I made an earlier post, inquiring about a suitable coolant recovery system for my '65 Mustang. I was rewarded with links to nice trim cylindrical stainless systems at a very good price.

However, I cannot find any info on the proper radiator cap to use with the systems. I know they are not the same as a standard cap that you would use without the recovery system. Those caps will not allow the coolant to be sucked back into the radiator during cooldown.

What exactly should I use and what would it's blowoff PSI be? I googled this subject and looked on Summit for such a cap, to no avail.

[rbinck]

I use a 16 psi cap. The replacements with the lever to bleed off pressure works fine.

[Ivy66GT]

Recovery systems require a special cap made for that kind of a system. A normal cap for a Mustang will push water into the overflow but never let any back into the radiator. Whoever sells the recovery system should give you an idea of what cap to use.

[thetvirus]

Just get a Stant 10229 part number cap, 13lbs and it works with overflow tank.

[Boomyal]

Seems to be a mystery as to what blow off pressure is OEM for the '65 289. I have a factory repair manual and it does not even say in the cooling system specs.

Additional to that, I can find no solid info on the differences between caps used with a coolant recovery system and those that aren't. Even the guy selling the coolant recovery systems on ebay does not seem to understand my question on the subject.