PI exhaust manifolds?

nordictom wrote: Hi Everyone,   Just reviving this thread to help identifying exhaust manifolds I have.    I picked up a 1972 Ranchero 429 N code. I knew the guy that owned it, & he was a Ford Guy. Anyway, I haven't been able to ID the manifolds on the car, but there were 2 manifolds inside behind the seats.  D20E-9430-CA D20E-9431-AA 2 I am curious if these are PI manifolds?  or ?  Any help to ID them would be helpful. TIA NT

Joe, that was my thought, these would have better flow than stock without the possible fitment issues of the headers.  I will be checking on getting it repaired and if possible will be using these.  Thanks to everyone for their input  -  dave

MrSmog wrote: Standard police big blocks maybe but the hi-po police interceptor engines got their own unique maniolds similar to the cobra jet manifolds of 70/71. they used them until 74 when those and the d20e heads went bye bye.

Do you have the part that broke off?

i was asking about the very end part where the exhaust system hooks to the exhaust manifold.so if you have to replace it you have what a loot of people sell with out..... 

Better picture, the part on the end?

what i was thinking jon was referring to is the thick extension looking thing in the lower left corner of this pic

Also another thought, would it be feasable/desirable to weld a hardened washer/flat metal piece onto the bolt head side of the damaged hole? Won't be a very visible area and it would spread the torque pressure off the weak spot in the bolt hole. 

OK, I'm not real clear on the heat riser aspect of this, the engine builder removed the manifolds and they were not installed on the engine when I got it back.  I'll throw a few pics on here to see if it helps.  Am I just looking for a deviation on the surface of the mating side of the manifold for different types/shapes of gaskets?

Sounds like I will be getting the hole welded up when I find a knowledgeable welder and have the resurfacing done.  For torinojon if you are talking about where the end of the manifold goes into the exhaust pipe there was a doughnut type gasket on one of them, don't remember if the other side had the same setup.

Looks like they need resurfacing if you can use them over. I didn't even use gaskets when I did the engine on my first gran torino back in high school.
Used a big flat steel plate and elbow grease to get the surface flat and shiny. I think we had sticky emery if I remember correctly. We weren't allowed to use machines aside from valve job tools.

OK, a little more info on the manifolds.  The drivers side has a date code of 07-27-72 part #D20E-9431-AA2 and the passenger side has a date code of 11-15-72 part number D30E-9430-BB.  I will post photos of the numbers and also the damage to the bolt hole area.  If the damage is repairable I would really like to use these and would appreciate any opinions on repairing them.  thanks  -  dave                                                                                                                                                                                               

Edited by 1973gts - 09-February-2019 at 1:38PM

Mustang Tek is a good reference resource, they don't show / list every part number / suffix but you can extrapolate a little. the notes do indicate that D2 & D3 manifolds were paired together for some applications http://www.mustangtek.com/exhaust/Exhaust.html


Edited by Rockatansky - 08-February-2019 at 6:22AM

The passenger side is the one with the bolt hole damage, not sure on the date code, can check later.

Reference the header part numbers I recently saw another set on E-bay listed as Police Interceptor manifolds with the same two part numbers I have, like Rock said I believe these were originally a set.  I am going to check if I can find a good welder locally that can repair these, would like to use them if possible.  I've mentioned this before but the previous owner used to drag race this car in stock class and these headers may be another part (along with a cam change) he snuck by the inspection at the track.