John sounds like you are hearing the hydraulic valve lifters pumping back up. If so it ran a little rough and smoothed out as the noise went away. I have mixed synthetic with petroleum based oil and had no problems. Not in a BB chevy but in a high reving honda with mileage over 250K and still doesn't burn oil. Changing to synthetic should have also resulted in some oil leaks as that stuff finds every loose spot. Synthetic is pretty pricy and I have experimented with longer intervals between oil changes. Started at every 2K changed to synthetic and pushed to 6K then to 8K with filter change at 4K and found the car started using oil at 6K, quart every 1K. So now I'm back to 6K with a filter change at 3K and the oil consumption is back at zero. So let us know if that click and clack come back.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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