They will fit either side. The passenger side outlet is at the rear, and the driver side dumps in the front. The only difference in appearance is the generator bracket boss on the driver side manifold, but it will bolt onto either head. The exhaust pipes will be offset- - - -one ahead of the motor mount and one behind, if the center mount position is used. The 55-57 engines used front mounts and bellhousing mounts, and didn't even have center mount bolt holes. Center mounts came out in 58.
News flash- - - - -I just bought a pair of similar manifolds (different casting number) for less than 50 bucks, including shipping! If I get around to finishing the 250 cubic inch high-RPM small block V8 I'm building, they should simplify the installation into some kind of "sneaky Pete" application like my Excalibur roadster!
Jerry
I found the oem exhaust manifolds with the number you provided for me (THANK YOU!). What manifolds are you talking about in your "news flash"? I was hoping to do an aftermarket header, something with more flow. Is that possible?
