I just read the 35 head adds 5 HP to the 34 version. since I am now starting the rebuilding of the motor,this is something to consider. i have a 52 spare motor. wouldn't the improvement have carried forward? I have not done any measuring yet so it is in the idea stage. An old thread talks about EMI in El Paso TX selling an aluminum head. I can't find any info on the.
any thoughts would be appreciated.
I believe the earlier heads are not interchangable with the 40's 50's heads. I know there are differences in the head gaskets. You can increase your compression ratio by milling the current head. they went frome a 5.8 to 6.7 which gave a 5 hp increase. With todays gas you can squeeze it a lot tighter for even more HP. You could easilly have it milled about .060 and probably bring your CR up to 7.5 ot 1 .080 mihg give you about 8 to 1. You would need to set your timing with a vacuum gauge to give you the most efficiency but mor squeeze, more bang.
I pulled the early 50's head and to my surprise the 34 head has less volume. the flat area extends almost to the valve clearance. the 50's flat are ended well before the valve area. profille and depth look to be the same. I'll stay with the 34 head unless I find an aluminum upgrade. what did Tim Allen say ? "More power"
Richard
I believe int he newer engines the piston tops came closer tot he top of the deck, so the area inthe head got larger to adjust. Also valve lift was greater on later engines.
Color me confused...
The 1933 and 34 blocks do not have the full length water jacket or water distribution tube. The result is that they are narrower than the 1935 and up blocks so the heads are not interchangeable with the later engines.
So I don't understand a thread that discusses swapping heads between a '34 engine and one from the '50s. Unless maybe a later engine has been installed in the '34, which due to a change in the starter motor location is not a simple bolt in.
34 Plymouth blocks 3 1/8 bore have a narrower cylinder head. 34 Dodge blocks... 3 1/4 bore use the same gasket right up to '50
Plymouth uses the same gasket on the 3 1/8 and later 3 1/4 engines as the Dodge from 35 to 50. After '50, the gasket will work but has an extra water passage up front. The 33-34 Plymouth is unique and neither the head nor the gasket can be interchanged with the later models.