Need info on heads.

[268RTs4ME]

Need to know what these fit, casting #s is 40006452, my book doesn't go there. Thank You

 

[Meep-Meep]

They are just the late model 400/440 heads with factory induction hardened seats. They will fit all the big blocks.

 

[69HEMICORONETR/TCONV]

Those are pretty much the same head as the famous "906" except they came after the 906s and the have the induction hardened seats that Meep-Meep spoke of.

 

[macdiesel]

The runners are supposedly "revised" too.

 

[69 Runner]

452 heads were very close to the 906s. The intake runner on the 452 is a little "flatter" than a 906, which hurts them a bit. HOWEVER....the 452 has more short side radius than the 906 which actually HELPS.

So what you loose on one side you gain on the other. And forget about the "hard" seats. You will loose that during a valve job, so count on having hard exhaust seats installed.