Alex Lowe Posted September 8, 2019 Report Share Posted September 8, 2019 HI all iv been using fuel additive in my late GT6 Mk3 registered 74 and have been considering having the valve seats hardened. I just read that these later cars had been adjusted for unleaded fuel for the american market is this also true for the British late Mk3s? If not is it worth having the seats hardened or just leaving it as i know of many people who do not bother with additive or harder seats Thanks in advance guys Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 8, 2019 Report Share Posted September 8, 2019 Alex, I have a late Mk3, Feb 73, the last upgrade and no, it wasn't unleaded modified. I no longer bother with fuel additive, it turned my plugs pink so I couldn't see if I was running weak or rich. The received wisdom is leave it until you start to detect valve recession, don't do it until you have to. Your engine could run for 10s of 1000s of miles before it becomes necessary. Doug 2 Link to comment Share on other sites More sharing options...
Gully Posted September 8, 2019 Report Share Posted September 8, 2019 The upside of fuel additive is the anti-ethanol element of the mixture, which is why I keep using it (along with the octane boost). I rather like the pink plugs - if they're too flamingo, you need to lean off a bit! Gully 1 Link to comment Share on other sites More sharing options...
Badwolf Posted September 9, 2019 Report Share Posted September 9, 2019 I am using Castrol Valvemaster, bought the bottle when I put the Spit back on the road 2 years ago. Lasting for ages. Yes, I am using the correct amount but no pink plugs. Why am I missing out? Link to comment Share on other sites More sharing options...
johny Posted September 9, 2019 Report Share Posted September 9, 2019 does it depend on which type of additive youre using? Im on Millers VSPe (manganese based) and yes the plugs tend to be brown but havent seen pink..... Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 9, 2019 Report Share Posted September 9, 2019 Where are you putting it?!! Doug Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 9, 2019 Report Share Posted September 9, 2019 I cant count how many thousands of miles i drove the rorty Vit6 1600 and many in my mk2000 with no recession or valve burning just using correct tappet cleaarances and sainbugs 97ron fuel , the castings have high levels of lead memory from prior years of leaded fuel burning i advocate dont buy must haves you dont need , buy fuel and drive them any chance of a head with exhaust inserts is probably ???? a very late 1500 , dont think they were ever available on the 6cyl as a production fit. (where's dave for some accurate history) Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 9, 2019 Report Share Posted September 9, 2019 Not on the GT6 anyway, and I doubt even for the USA market. By the time the last GT6 rolled off the line we were looking at the doomsday scenario of petrol running out! Link to comment Share on other sites More sharing options...
Badwolf Posted September 9, 2019 Report Share Posted September 9, 2019 7 hours ago, dougbgt6 said: Where are you putting it?!! Doug In that hole in the back... where else? Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 9, 2019 Report Share Posted September 9, 2019 db "Where are you putting it?!!" BW "In that hole in the back... where else?" There's a joke here somewhere, but not on this web site. db Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 9, 2019 Report Share Posted September 9, 2019 Oh God I can see where this is going... Link to comment Share on other sites More sharing options...
Badwolf Posted September 9, 2019 Report Share Posted September 9, 2019 Exhausting, isn't it? Link to comment Share on other sites More sharing options...
ShaunW Posted September 9, 2019 Report Share Posted September 9, 2019 5 hours ago, Colin Lindsay said: Not on the GT6 anyway, and I doubt even for the USA market. By the time the last GT6 rolled off the line we were looking at the doomsday scenario of petrol running out! Running out of petrol would have been an inconvenience, instead we've had the actual doomsday scenario of petrol not running out. For decades now I've single-handedly tried to use all of the remaining oil and petrol, to try and save the planet.😉 2 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 10, 2019 Report Share Posted September 10, 2019 16 hours ago, ShaunW said: For decades now I've single-handedly tried to use all of the remaining oil and petrol, to try and save the planet. I'm at the other end of the scale - for decades now some of my Triumphs have not left the garage, thereby saving the planet, not to mention petrol. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 10, 2019 Report Share Posted September 10, 2019 if the wife stopped burning everything the planet would have a chance Link to comment Share on other sites More sharing options...
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