I recently installed the rebuilt 350 in my 69 coupe. Each time I run the engine (have not taken it on the road yet, just moving it in and out of the garage) I find a very small puddle (2"-3") of antifreeze under the car. It is dripping off the bellhousing. I suspect a freeze plug is leaking on the back of the engine. I really don't want to pull the engine to investigate and replace the plug. Any suggestions? Has anyone had any luck with the radiator leak stop products that you put in the antifreeze?
Instead of pulling the engine, you could drop the transmission and replace a bad plug that way.
69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at: To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Crush and drop in one of these in your rad. GM adds 2 per new Cadillac on the line. I use them and never have had a problem. Once it's sealed you can drain and refill with clean antifreeze. Remember to drain the block. I had a small drip from a freeze plug yrs ago and it sealed it and when it was time to flush the cooling system yrs later, it did not leak and I did not have to add a seal tab.