In anticipation of a Sterling carb I've been doing some things to make my car worthy. Freer exhaust, and scheming on intake improvement. I bought this advertised as an Rx3 mani, but it seems either older or previously modded. It's got 1/2" more rise fore, and 5/8" more rise aft than an 84/85 mani. Included is the visible wedge shaped spacer, and a gasket with a break between the primaries. There are no passages between primaries or between primaries and secondaries. Please bear with the picture posting method. Thanks and a donut!
https://twitter.com/andrewsiff/statu...34444068012032
https://twitter.com/andrewsiff/statu...34350119792640

 

looks like a RX-3 manifold....you might have to modify the intake port if putting on a newer 12a engine

 

it looks like the Rx-3 manifold i once had on my Rx-7 back in the day.

if Wacky (i think his name is Siraniko or something now) or Jeff20B don't chime in, you may want to drop them a PM to confirm. they would be the most likely to pinpoint exactly what you have.

 

I can't see the pics.

 

This should work.
Mobile Photobucket

 

That could be from an RX-2. The primary runners are lower than the later engines. It will still work on a Y or R5 intermediate plate as long as it has tall runners.

News Flash! If you ever wanted to do a half bridgeport, that manifold you've got there, can work.

 

I hope you're enjoying your virtual donut. It appears some mods were done to smooth out the exterior of the mani. The runners are completely separate. On a stock 12a, would it be advantageous to channel between the primary/secondary openings? At all between the primaries to some degree? The carb will be a Sterling, or my own '85 stripped Nikki.
Any engine porting will be in the somewhat distant future, and will be kept at a street driveable level.