Leaded or unleaded - That's the question, Need advice on which type of fuel to use.. Options

[reineg]

Hi there, Laymen and Experts alike!

I have recently acquired a 914/4-70 with a newly built engine. Up to 2.2litre and some extra horses to boot. But now to the question:
The car has got new cylinders and pistons from Pelican Parts, but I do not know much more about the engine. So do you guys (and gals) reckon it would be safer to use modern fuel and add lead, or shall I just go for modern fuel and not add lead?

What is most detrimental to the engine; to add lead to an engine that doesn't need it, or not to add lead to an engine that requires it?

Appreciate any and all thoughts on this..

[technicalninja]

Is leaded gas or real lead additives available in Sweden for road use?

I thought it was illegal everywhere for use in road vehicles...

Here in the USA if you want real leaded gas, you either have to by AV gas or specific race only fuel.

[wonkipop]

Is leaded gas or real lead additives available in Sweden for road use?

I thought it was illegal everywhere for use in road vehicles...

Here in the USA if you want real leaded gas, you either have to by AV gas or specific race only fuel.

there are additives here for older cars that used to run on leaded super (premium i think in USA speak). its not lead. its some kind of substitute. it lets those high compression engines run safely. somehow that ties into the idea that it protects the exhaust valves.
its never been entirely clear to me why thats necessary. but i know a guy that runs a couple of 60s and 70s ford falcons with original V8s and he pours it into each tank of fuel.

but lead is a big no no anywhere now in the environment.
you cant even use it for roof flashings if you were say restoring an historic building where the original flashings were once lead. particularly on 19th century slate roofs.
its just non available. non usable. banned.