BTW, they are called manifolds....not headers....technically speaking.

My 9779495-1 date code I217 is cast with SAMPLE

My 9779494-1 K277 is cast with SAMPLE

For your HO site...why was there such a date code discrepancy between manifold dates and chassis build and engine/head casting dates? The manifolds were cast on a 1 for 7 basis. as in for every 7 days regular non HO manifolds were cast, a one day run of HO/RA manifolds were cast. Why? supply/demand.

Source? I went to the LORDSTOWN plant reunion and talked to men who worked on the line.

I have owned MANY pre 67 long branches without date codes cast SAMPLE.

I have a service bulletin that the 1607 casting with a heat riser was used to replace the 9494 casting for pre heating issues.

It would be responsible when you post info...to quote your sources.

I see you are doing a lot of fishing on many Pontiac boards for your HO site. John Schuh (Framair) did that on this site many moons ago fishing for Ram Air, Ram Air I and Ram Air II info and VIN's...and disappeared. If you are going to use other peoples sources and info..either credit them appropriately or dont publicly post it. From Jim Mattison himself to me..I asked about the Ram Air Registry...VIN, cowl tag data, options...

His reply?

Immoral purposes.

I understand the wealth of knowledge does us all good... Many others on many other sites have provided the info you sought (UQ radiator specifically)

In essence...give credit where credit due.

As you can see from the link below....what happened to the registry?

https://firstgenfirebird.org/f-a-q/ram-air-features-for-1968/

Just as every 1967-1968 Firebird restoration guide out there regurgitates [censored].... buying a lab coat, stethoscope, and a Mercedes doesn't make me a doctor.