I.D. these header flanges please

Look like chevy but these are bigger. thanks in advance for your help.

 

Ford Y-Block maybe?

 

No, a Y block has a bolt hole between the center ports.

 

Look like Big Block Mopar 383, 413, 426 max wedge, 440.

 

Don't think so, big block mopar ports are more rectangular than that.
It could also be a wierd camera angle or something too.

 

maybe 348/409 ? ...s/d pontiac...? brandon

 

take them down to a local speed shop and match them up. also maybe a "old school" exhaust shop can help. good luck.

 

probably sbc for some heads with big, raised ports