Re: Need Cylinder Head, '34 8. What Yrs would be Interchangable ?

Posted by flackmaster On 2020/5/10 22:23:35

NO, the earlier heads will Not interchange. NO can do.

The main difference between the 33-34 heads and the 35-38/39 heads are the 33/4 heads have the integral water outlet and 4 bolt distributor mounting. Functionally they do interchange. Dave/O-D I am surprised you have a 242511 head on your spare motor, that is the 1939 head with the revised/improved water coolant passages. Correct me, didn't the 3044330 distributor still have the 4 bolt stand? Maybe not. Surely an easy answer to that.

I do not have any 33-34 heads available. I do have a 242511 head available, along with a 338xxx (number escape my brain at the moment ...813? too lazy to go out to the garage right now) but it is the best cast iron replacement head Packard made for the 33-38 style coolant holes...slightly higher compression, oh joy! NOS McCord gaskets (33-38 style) too...love that good old american asbestos...

You can use either head, subject to a 3 bolt distributor mount (have) and a bolt on water outlet (have), so after you digest what has been said, as AJS knows, I am ready to help.