Hardened valve seats

[Challenger340]

Personally, I just never bother with putting hard exhaust seats in ?
A little bit of 2 stroke Oil per tank of Gas lubricates the Seats same as the old Leaded Fuel used to ? about 200ml per 10 gallons... and NO it won't smoke like a 2 stroke !

The ONLY reason I can find to install hard seats.....
is IF the original seats are already sunk to China, and it HAS TO have them for a restoration ?
and even if they are...
far easier to just enlarge the sunk seat for a larger Valve ? ... so still makes seats redundant ?

 

 me too....I have never had to put them in any of my cars

Competition valve grind, new valves, new guides, mild .455" lift cam (120lb seat, 320lb over the nose). After about 5000 miles, the exhaust seats were pretty bad.

Were you adding about 200ml of 2 Stroke Oil per Tank of Gas to lubricate the Seats ? or just running the dry unleaded fuel straight out of the pump ?
Just wondering, any idea how high your EGT's were running ?

[BSB67]

Personally, I just never bother with putting hard exhaust seats in ?
A little bit of 2 stroke Oil per tank of Gas lubricates the Seats same as the old Leaded Fuel used to ? about 200ml per 10 gallons... and NO it won't smoke like a 2 stroke !

The ONLY reason I can find to install hard seats.....
is IF the original seats are already sunk to China, and it HAS TO have them for a restoration ?
and even if they are...
far easier to just enlarge the sunk seat for a larger Valve ? ... so still makes seats redundant ?

 

 me too....I have never had to put them in any of my cars

Competition valve grind, new valves, new guides, mild .455" lift cam (120lb seat, 320lb over the nose). After about 5000 miles, the exhaust seats were pretty bad.

Were you adding about 200ml of 2 Stroke Oil per Tank of Gas to lubricate the Seats ? or just running the dry unleaded fuel straight out of the pump ?
Just wondering, any idea how high your EGT's were running ?

No oil.  No measured EGTs.  EGTs low enough to keep the paint on the exhaust manifolds.