Converting stag to unleaded petrol

[Frank]

Would appreciate some idea of the cost of converting mark 2 stag
to run on unleaded petrol
Regards

[jamcarr2]

imported post

£000.00

It will happily run on unleaded because the stag was built for the American market so it was designed to run on unleaded

JOHN

ps welcome to the forum

[jleyton]

imported post

Frank wrote:

Would appreciate some idea of the cost of converting mark 2 stag
to run on unleaded petrol
Regards

The Stag was designed for the US market who were already using unleaded fuel.

Accordingly, most (me included) will say that you don't need to do any conversion. The principal problem on vehicles not designed to use unleaded is the lack of lubrication, provided by the lead, to the valve seats and they slowly wear, or regress.

The Stag's valve seats are made from hardened steel and so regression is not a problem however there may be a small chance that the engine has been worked on and so you can't be 100% certain if everything's as good as original.

Me, I've never worried about it - famous last words :shock:

Cheers

Julian

[STAG1973]

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Mine is original andruns fineon unleaded and there is no needfuel additives

Adrian

[Frank]

imported post

Thanks, will discuss with seller when i view stag
Regards

[brian0443]

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Everything should be fine, but some people were not convinced and paid quite a bit of money for conversions etc that most of usagree were not required. If this is a case in pointdon't pay extra for an unleaded conversion. If it was done recently you might consider an overhaul that probably went with it to be worth some money, or at least to give you somehope of an engine in good nick.

Brian

[riviera kid]

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Hi ,Frank,welcome to the forum. Stags should run perfectly ok on unleaded as the heads were fitted with hardend valve seats for the federal cars,and this continued to the end of stag production.There is a possibility that some vsr (valve seat reccesion) can occur if revs of over 5000 of .are maintained for long periods over 1000's of miles . This is is highly unlikely the way most of us drive our stags.If you were intending to do a head refit it would be wise to renew the seats anyway .So like most of us worry about it if and when it happens.Regards Tony.

[Frank]

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Thanks everyone,will check it out when i view the stag
Regards to all

[martin]

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Hi Frank, welcome aboard. There's no question of valve seat recession, but the exhaust valves can suffer in time. The pros fit TR7 exhaust valves, that prevents any potential problems. Cheers, Martin.