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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2015 Posts: 39 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2015 Posts: 39 | Oil in the radiator is usually caused by a cracked block (between the oil gallery and a water jacket) since oil pressure is greater than water pressure, oil moves to the radiator.
During the machining of 6 cylinder chevy's the oil gallery is drilled from the front half way then from the back half way. The hole doesn't meet exactly in the middle. This can cause a stress riser at the meeting point. Overheat and viola crack. These cracks are difficult to find normal magniflux will not find them. Pressure test of the oil gallery will but this test is difficult to perform.
Tim White
49 Chevy panel
91 Jeep YJ
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