I have thought of trying fireplace window cleaner (Ace Hardware, hand-spray) since it dissolves all kinds of hydrocarbon build-up. I think ammonia is the main ingredient.
I've seen references to the Mopar stuff since i started reading FSM's in the 60's but never had any to try. Having said that I'd imagine it is MORE than just a rust penetrant. If I was going to spec something like that, I'd probably want a penetrant as a carrier but then as it evaporated or otherwise went away, I'd want lubricant left behind to lubricate the shaft and related parts. I'm thinking a graphite substance.
I'll have to get some for my 64 slanty as it has the heat riser in place and it works! My 68 is a small block with headers and I blocked the crossover in the manifold so It's a little cold blooded until it warms up. Makes the cam sound bigger
