Vortec valve seats?

[Pinger]

Do cast iron Vortec heads have pressed in valve seats or are the seats cut straight into the iron?

 

[GoToGuy]

Where did hear iron heads don't have hardened valve seats?

 

[Pinger]

Where did hear iron heads don't have hardened valve seats?

Nowhere. They have inserted seats then?

 

[evilunclegrimace]

Nowhere. They have inserted seats then?

Yes.

 

[Schurkey]

I thought "SOME" (higher GVW) Vortec heads had exhaust seat inserts, while "MOST" Vortec heads have the induction-hardened parent metal on the exhaust side; and none of them have inserts on the intake side.

 

[Hipster]

I thought "SOME" (higher GVW) Vortec heads had exhaust seat inserts, while "MOST" Vortec heads have the induction-hardened parent metal on the exhaust side; and none of them have inserts on the intake side.

^^^ This

 

[GoToGuy]

I have not done a teardown on a OE vortec head yet. I wonder what the reason for the change. Cost, better induction process, was inserts unnecessary as fuel combustion requirements.

 

[Hipster]

Cost cutting, extra time, extra machining, extra parts to do seats. In my experience it was the over 8600 gvwr that got the hardened exhaust seats, early model USA production as opposed to Mexico produced engines and heads.

 

[454cid]

Cost cutting, extra time, extra machining, extra parts to do seats. In my experience it was the over 8600 gvwr that got the hardened exhaust seats, early model USA production as opposed to Mexico produced engines and heads.

I thought the Mexico cast blocks were only crate engines in the US?

 

[Hipster]

I thought the Mexico cast blocks were only crate engines in the US?

I think they were going in light duty trucks as well