I looked it up on the search engine & there was a guy who asked the same ?,But he didnt get an answer,so i am gonna ask it again,what kind of flow #s do the stock 317 castings flow ?Also the 317 castings ,which motors were these castings off of ?escalade ,etc ?I have a seller that wants 300.00 for these heads fully assembled ,is this a good deal ? I was thinking of using them on an ls2 402 ,fwiw the 402 is a 9 to1 comp shortblock ,Maybe have them cnc ported & Have a valve job done on them ,i may come out cheaper by buying a set of Lq9s allready ported for cheaper than i can have the 317s worked on,i appreciate your input fellas ,have a great Day ,vette#3

 

https://ls1tech.com/forums/showpost....71&postcount=3

Stock 317's came on 6.0L engines: escalade, trucks, hummer, etc...

Just another bit of info some 6.0L engines came with 035 heads. These are virtually the same as 317's for all comparison purposes.

 

,What bore is this flow sheet based off of ?Ok i see it is a a 3.90