Join Date: Sep 2017
Location: Jacksonville, FL
Problems with 300CI straight sixes
Hi all, I have caused myself a few problems with my engines and I'm wondering if anyone has suggestions. My first engine had a blown head gasket and I found a good head and had it inspected by my machine shop and it passed with flying colors. Flat as a pancake, didn't need a valve job and passed a magniflux test. Soon after I installed it, I ran the cooling system dry and it broke down on the Interstate. I nursed it home by adding water and driving about a mile at a time until I was home. It was very noisy but I never had an official diagnosis and I decided to replace it. I still have it. I found a replacement at a quality used Ford parts house here in Jacksonville (Rusty Acres). They have a great local reputation and the engine came with a no questions asked 90 day warranty. I got preoccupied and let the warranty expire. When I finally installed it, it would run for about 2 minutes and then lock up and stall. It had the correct oil level and water level. Soon thereafter it wouldn't start at all. The starter motor was bogging down and turning it by hand was nearly impossible. I pulled the head and the binding was still there.
Where should I go from here? Which engine would be the best bet to repair? The truck is a 1981 F-100 Custom short bed.
I take full responsibility for my predicament, please no guilt or shame. I feel bad enough as it is.
Clean and sober for over 32 years by the Grace of God.