ISO late 70's Aluminum 425 intake.
I believe these may have been OEM for Limos.
Cheers,
e
If I'm not mistaken the only factory aluminum intakes in the 500/472/425/369 motor series were the highly restrictive ones used on the 368 motors
Greg Surfas
Shoot - you may be right.
there seem to be a few people that believe they are out there although only slightly restricted i guess.
check out Scotts comments around 26:00 - he sounds fairly confident its a 425 but seems pretty rare.
https://www.youtube.com/watch?v=GTJsHM6fzUw