I've been able to remove manifold nuts with PB Blaster. It does work.
On Mon, 19 Jan 1998, Martin Libhart wrote:
> For what it's worth...
> After trying several different products (Liquid Wrench, etc.etc.) over
> the last 2 weeks to free up some badly frozen brake bleeder fittings, as
> well as 2 clamp bolts on an exhaust pipe, I finally gave in and spent
> twice the $ for a spray can of "Blaster". Available at PepBoys and other
> parts outlets.
> I'm the first to be skeptical about any of these products that make
> their fantastic claims, but this product works! It is totally different
> than most of the 'solvent-type' products - it actually looks like orange
> colored milk out of the nozzle, and foams upon contact with the bolt or
> part. I soaked each fitting and bolt 4 times over the last 24 hours,
> went out today to check them with a wrench, and "bingo"!
> All standard disclaimers apply - just a product that I found to work and
> would recommend highly.
> Martin Libhart
> 1972 TR6
> 1970 Spitfire