452 or 906 heads for 440 build

[moparnorth]

which are better 452 or 906 heads for 440 build for 1970 Coronet

 

[PRHeads]

Will they be left stock or getting modified?

If modified........ how modified?

 

[Nate S]

452 flow as well and have hardened seats. If you won’t be machining away the hardened part, 452 is a nice choice. If you are cutting that away, it doesn’t matter much. Also, if you don’t drive much it doesn’t matter much either.

 

[moparnorth]

Will they be left stock or getting modified?

If modified........ how modified?

will be ported

 

[PRHeads]

Then I’d talk to the head porter and see if there will be a difference in the cost for porting.

906’s flow a bit more in truly “ootb” form, but are more labor intensive than a 452 for a given cfm point, from about 240 up to about 280cfm or so.
More porting time usually = more expense.

Aside from that, I’d probably use which ever were in better condition, and had less core shift.

 

[IQ52]

Then I’d talk to the head porter and see if there will be a difference in the cost for porting.

906’s flow a bit more in truly “ootb” form, but are more labor intensive than a 452 for a given cfm point, from about 240 up to about 280cfm or so.
More porting time usually = more expense.

Aside from that, I’d probably use which ever were in better condition, and had less core shift.

Sweet.......I always like your rational, well thought out responses.