4g61t head = 4g63t head

[versatileperf]

hey my question is does the 4g61t head and 4g63t head are they both the same? they look almost identical i know you can run all the 4g63t stuff in a 4g61t head.....anybody know if they are exact same or not, i know cams and valve cover are different but everything else seems to be about the same.....

 

[kicker91laser]

The size of the combustion chambers are different, and the port sizes are different. The c.c on the '63 head is a little larger than the '61 head. Hope this helps