Which gt40 aluminum heads are these?

[drewzx3]

OK the casting number on them are 19735 with j302 at the end. So which one are these? Also about how much is a used set worth?

 

[DDSTANG94]

I think there a Gt 40 style head with bigger valves??

 

[final5-0]

I can't be sure ... but .............
My first thoughts about those heads are they are fairly old technology.

I wanna say like before the turbo swirl and all those heads

Again ... I ain't sure ... but ... Seems like they'd be better than E7's

I'd think you could search the various forums
and
Google up some helpful info on them

Grady

 

[94 Black GT]

there might be some lines cast in to the side of the head..you can search for what each set of lines means i think?? i think i just remember something like this a while back..

 

[94Cobra69SS396]

This url has some flow numbers on them as well as other sbf heads. http://www.thatmetalbox.com/automotive/sbf_head_flow.pdf