Question on speedmaster heads

[MerlinsMopars]

I want to get a set of these heads for my 340 so I can run unleaded. They are the loaded ones for $1015.00 at jegs but they are saying something about raised exhaust ports and I have the dougs d453 headers. Are these headers going to work with these heads? Going in my 71 challenger.
Any setbacks that I need to look out for?
Thanks,
Scott

 

[1972CudaV21]

If you‘re just concerned about using unleaded gas, the valve seat lubrication is rarely an issue.

 

[MerlinsMopars]

If you‘re just concerned about using unleaded gas, the valve seat lubrication is rarely an issue.

My x heads are unusable because of using unleaded. The valve seats are beat up in the heads and machine shop says thats why.

 

[1972CudaV21]

My x heads are unusable because of using unleaded. The valve seats are beat up in the heads and machine shop says thats why.

Gotcha

 

[Steve340]

Can you find out how much the port is raised? If it is only a small amount you might be OK??

 

[MerlinsMopars]

1/2"

 

[Steve340]

That is quite a bit. Off the top of my head that could cause problems.
Never used those heads though.

 

[Chryco Psycho]

Sorry I don't have experience with using those heads .