Recent 340 Rebuilt – Coolant creating thick green film

I recently took possession of a long term resto project and was excited to finish up a few small items.....until I opened rad cap and saw thick green film on top of coolant. The 1973 340 was rebuilt by a reputable shop but not dyno'd just installed and broke in, prior to me taking possession. The rad is new also.

So you might say "bring it back to the shop". Well resto work done in MI and car was shipped to me in CA day after Xmas...so not so easy to solve with the shop.

Pics attached.

I...

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Author: Titan1969