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Ok a long time ago a close friend made me some custom heads & cast them in pewter. Sadly he's now deceased & his estate including molds & masters was lost in a fire. I was curious if it would be safe tip bake the items in sculpey to create new molds as I have sculpey but not true molds making material right now nor can I afford it. As he's no longer alive & he wasn't a company there's no one to ask what the lead consistency is. Any thoughts?

I would not recommend baking the models. Pewter has a very low melting point (hence why it is used to cast models) and while I don't know the temperature you need for sculpey, at the least you could soften and deform the models if not downright melt them.

Pewter is also very expensive these days, even for commercial use (that is one of the reasons many companies like GW no longer use it). My advice would be to invest in a resin casting kit, or even thermoplastic and Milliput. Resin casting supplies can be had for cheap at Hobby Lobby (as can Milliput) while thermoplastic can be found by searching the web for "Blue Stuff". That is the product name but I've forgotten the company name.

Your best bet would be too make some molds out of them for resin casting.

Apparently pewter has a melting temperature in the 170-230° C range (338-446 °F).

Personally I wouldn't risk it though, I'd just save some money and get some silicone casting tools.