Cylinder Head Seats

[MOPARJ]

In what year did Chrysler Corp. begin usung hardened seats for unleaded fuel in their 318,340,360, ect. Was it beginning with all 1973 models?

 

[340mopar]

I believe it started late '71 being lower lead fuels were coming into play. But '73 heads were definately hard seats. The seats are not inserts they are just flame hardened.


Chuck

 

[grumpuscreature]

Slants in 1972 and everything else in 1973. :thumbup:

 

['64 Cuda]

When was the J head introduced? I'll have to check the ones I have. Maybe they already have hardened seats.

 

[lenweiler]

1970, and no.