Lead substitute additive?
#1
#2
If it was overhauled properly it will have the hardened valve seats. Additives to some are needed but unless you are driving hard or racing all the time it is not necessary. I have driven the pre-70 Jags to 200K miles and never had a valve problem to no lead fuel. Bigger problem is pinging from too low octane. The pinging can really tear up the aluminum head.
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Mikey (03-30-2015)
#3
It's very doubtful the valve seats will have been replaced; this is a big job, and in the 70s would have been very unusual.
As Jagfixer says, it is not usually necessary on these engines as the valve seats are normally hard enough for the kind of useage these cars get nowadays. Jaguars have been able to take unleaded since the mid-sixties,, although your cylinder head is earlier. I believe, though, all these engines had chilled cast-iron valve seats from the start. I may be wrong thogh.
However, if you're a bit nervous, try Castrol Valvemaster: -
There are two types, the "Plus" variety also has an octane booster. I use it all the time in my MG Midget engine. The bottle has its own measurement device. It just takes slightly longer to fill up at the filling station, that's all.
As Jagfixer says, it is not usually necessary on these engines as the valve seats are normally hard enough for the kind of useage these cars get nowadays. Jaguars have been able to take unleaded since the mid-sixties,, although your cylinder head is earlier. I believe, though, all these engines had chilled cast-iron valve seats from the start. I may be wrong thogh.
However, if you're a bit nervous, try Castrol Valvemaster: -
There are two types, the "Plus" variety also has an octane booster. I use it all the time in my MG Midget engine. The bottle has its own measurement device. It just takes slightly longer to fill up at the filling station, that's all.
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sailor (04-03-2015)
#5
If your really keen on converting your unleaded to leaded as opposed to merely using an additive i can recommend this TetraBOOST: Product Information
Not cheap but it does what it says
Not cheap but it does what it says
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sailor (04-03-2015)
#6
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