How to free up a stuck engine?

Who has a proven concoction for pouring into the cylinders of a stuck engine?. I have heard many and remember none:icon_weed:
Thanks in advance!.

Matt,we use deisel mixed with atf.Some guys use brake fluid.

I've used this method: spray WD-40 ( or PB blaster-type stuff), then some Marvel mystery oil. Worked for me years ago... good luck.

I second the diesel and ATF

acetone and atf 50/50

Thanks guys, I'll try one of them and let you know how it worked.

A friend just had just picked up an old flathead ford that was in a car sitting for 30 plus years. The marvel mystery oil and ATF worked it free. He could move it in a few days and just worked it by turning the motor at the balancer until it was freed up. Add a little each day.

Matt,we use deisel mixed with atf.Some guys use brake fluid.


Ditto.....ATF/Deisel!!

I went with the Acetone and atf, I had both in the shop.

If it is froze up why waste the time pouring stuff in the eninge, you already know you have to tear it down and rebuild it, just pull it apart and pull out the hones, time is of the essence. We only live once and the sooner we enjoy our rides the better!!

Most people know they will have to rebuild the motor regardless. But if you still want to use the block you have to get the old stuff out first without damaging anything.

I went with the Acetone and atf, I had both in the shop. That stuff is better than pb blaster but watch it on paint.

Thanks guys. The engine is in a `70 Challenger project car that I have up for sale, so I just wanted to get it freed up, being a matching #'s 340 car.