For those who might be interested: One idiosyncrasy specific to the original 1960's FoMoCo C6FE 289 cylinder heads was the bolt hole to the right side of each exhaust port was drilled through into the water jacket. Back in the day, after seeing water seeping out near several exhaust ports, more than one mechanic concluded the head was cracked.
The preferred cure was to install a short set screw (with sealant) deep under the header bolt, or apply sealant to the header bolt threads.
As Randy correctly posted, cracks in original C6FE heads were quite common. Usually, the cracks occurred at the lower outer corners of the head.
The preferred cure was to install a short set screw (with sealant) deep under the header bolt, or apply sealant to the header bolt threads.
As Randy correctly posted, cracks in original C6FE heads were quite common. Usually, the cracks occurred at the lower outer corners of the head.