engine parts decoding

[70daytonaclone]

yes i need some help decoding engine parts,440 cylinder heads which should I use?4006452 or3462346 and this is the # on my 440 crank dampner 83184-343-2 any help  would be greatly appreciated.

[70daytonaclone]

oh yea i did look ecoding and all i found was cars forsale! yeaaa

[Just 6T9 CHGR]

"452" heads are later model and have hardned seats.  They are compareable in flow #'s to the "906" heads (which dont have hardned seats)
Not sure on the 346's though

[694spdRT]

The 346 head started in 1971 replacing the 906 and they did not have hardened seats. They went through 1973 I believe. I would use the 452's if date codes are not your deciding factor. 

[70daytonaclone]

thanks the 452s have magnum springs also so I will get them freshened up and use them.