8 RT Heads

[TomC750]

I just got myself a flathead out of a 51' f1 and the heads are 8BA and Im surebthey are factory. Bellhousing and pumps are 8RT

I have a '49 engine with 8RT heads.

 

[mercjoe]

Either yours or my heads could have been changed

I have a '49 engine with 8RT heads.

 

[38 coupe]

I think there is some mistaken information here. The big compression ratio spreadsheet shows the 8BA, 8RT, and EAC cylinder heads all have the same combustion chamber size and therefore same compression ratio. That makes sense with Ford bringing out the 8RT heads for truck use in 1952 when the passenger cars switched to the higher compression EAB heads. The Ford parts books also back up the use of 8BA heads on trucks before 1952.


Edit: link added to the Techo Source that contains the compression ratio tables: https://www.dropbox.com/scl/fi/pt6x...2mxacgarb7no9359r85db3vh&e=2&st=t3ar9y42&dl=0