• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

68 GTX 440 puking AF


Well-Known Member
Local time
7:04 PM
Dec 12, 2012
Reaction score
kansas city
Need a little input here. I worked on a guys 68 GTX 440 auto a few weeks ago. He said it was overheating and losing antifreeze. Here's what I did to it.

Removed the water pump housing and water pump from the front of the engine. The housing had some cavitation damage on the back side of it, so I sanded it down until most of it was removed. Then I reinstalled it, along with new gaskets, a new water pump, new t-Stat (160), new t-Stat housing (it had cavitation damage as well), and new antifreeze. I also had the radiator cleaned. Then I had him buy the correct metal fan Shroud from Dante's and I installed it.

I let it sit and idle for 2 hours and the temp guage was barely above the lowest mark. Ran great not getting hot.

Now he's telling me that when he drives it & shuts it off, it pukes out AF on his garage floor. He thinks it's running hot. I don't believe it is, but I haven't seen it for myself either.

BTW, This is a numbers matching 440 car that he paid a ton of money 12 years ago to have a ground up restoration done on. And he's probably put less than 1000 miles on it since. It only has 80,000 miles on it so they resealed the engine and put a new camshaft, lifters, timing chain, oil pump, etc. On it. So it's basically a stock 68 440 engine. Cast iron intake, thermo quad, cast iron manifolds, stock distributor, stock fan with clutch, (7 blade? Or 6?)etc.

My question is this: if I filled the radiator full, would it puke out a little antifreeze until it got an air space inside the radiator? I'm thinking that's what's going on.

Also, would it be a good idea to add an overflow bottle to it?

Hes going to bring it back to me and I need to know where to start. I'll let it run and shoot the engine and hoses with my heat gun so I can see how it looks. I'm thinking that an overflow bottle would remedy the antifreeze loss problem.

What advice can you guys give me? Thanks in advance!
Either it's gonna puke till it finds it's level or you can add a overflow tank & make it a recovery system which is what I've done to all my old cars...
That's why they invented the recovery system. Some days if it's hot outside or if the car has been driven hard just before being shut off (or getting stuck in traffic) it's going to puke some out.

I've got a "manual recovery system" - basically a bottle that it can puke into, which I remove and pour back in to the radiator. It only does it occasionally, but it's better than leaving a mess on my garage floor.
antifreeze expands when hot..... if you fill it to the tippy top cold, it will puke hot
Last edited:
Recovery system. Make sure it's done correctly. Placement of overflow container. Went through this on the Duster.
generally speaking top radiator tank should be half full leaving room for expansion
Level should be 3/4 to an inch down from the top of the rad tank. Also don't rule out a bad cap...
I just fill it above the cooling tube fins cold. The upper tank doesn't cool anything anyway.
And I would put a 180 degree or higher thermostat in it.
After owning seven stock GTXs, I concur with all the previous posts. One had an after market overflow tank installed (required by Capitol Raceway back in the day), problem solved. On the others, holding the coolant level down solved the problem.
On the stock cooling system, I only fill to the baffle. It's about a inch above the cooling tubes, but not nearly completely filled. Anything over that will puke out the overflow on a hot day. As @1 Wild R/T said, it will find its level.
Auto Transport Service