is there anyway a person is to tell if the head was port and polished from Portflow
ive got this gsr head and the previous owner said it was ported and polished by portflow, but i dont know what exactly to look for.
do they have any kind of stamp on the cylinder head for me to identify???
or is there anyway i can tell by the porting job itself???
all help is appreciated
tanks

 

the exhaust guides are ground down, otherwise i dont think theres anything else
really noticable if you havent seen a lot of his heads.

 

are the outlets suppose to look somewhat similar???
cuz number 1 and 4 look alike and 2 and 3 looks alike
but they all dont look the same???
i can tell its ported and polished but im not sure its PORTFLOW's