What's the difference between VIN code 9 and VIN code Y for the 307 on the late 80's Broughams?

Go to : http://www.100megsfree4.com/cadillac/cad1980/cad88.htm and read :D

Go to : http://www.100megsfree4.com/cadillac/cad1980/cad88.htm and read :D
Mmmm sorry. That doesn't help me. It doesn't tell me anything about the 9 code or the difference between the 9 and the Y.

Cam (more lift, more duration), heads (in 85, no change in 86-90), carb (special calibrated), cast manifolds (some "Y" had tubular steel, which were narrow in flow, the cast were the same as the older Olds).

ECM calibration.

Note that Prior to 85 the "9" was a non roller engine. The "Y" 307 went roller in 1985. Some early 85's MAY have had the non roller. The indicator is the presense of 6A or 7A heads. The 6A are 7A's without AIR provisions. I have never seen them, rumored to be Canada only heads.

Check the Olds FAQ for more. http://www.442.com/oldsfaq/ofe307.htm#E307%20307CIDEngineDetail

VIN Y, VIN 9 Comparison
Here is the deal on heads, exhaust manifolds, & camshafts. This information comes from the 1982-1990 Oldsmobile B,C,D,E,G,X parts manual - 1998 version.

Year Part Number
Cylinder Head:
82-84 Y,9 22511238
85 9 Same (22511238)
85-90 Y 22530557
86-87 9 Same (22530557)
Camshaft:
82-84 Y 22521997
83-85 9 22519934
85-90 Y 22527149
86-87 9 22531804
Exhaust Manifolds:
83-90 Y 22503678 LH Cast Iron
83-87 9 Same (22503678) LH Cast Iron
85-87 Y 22530287 LH Tubular Welded Stainless
83-90 Y 22521449 RH Cast Iron
83-87 9 Same (22521449) RH Cast Iron
85-87 Y 22530286 RH Tubular Welded Stainless

So, in summary. The 82-85 VIN 9 and 82-84 VIN Y had 5A heads with regular cam, the 85-90 VIN Y and the 86-87 VIN 9 had 7A heads with roller cam. Notice the VIN Y changed to roller cam 1 year before VIN 9 which is causing some confusion.

Also, the tubular stainless exhaust manifolds were used on some 1985-90 VIN Y applications, but there is no set pattern. The stainless manifolds require a gasket, the cast iron do not. Finally, the GM Goodwrench remanufactured engine assembly numbers are different for tubular stainless vs. cast iron manifolds. I do not know what is specifically different, the book just says 1 is to be used with tubular, the other with cast iron.
[ Thanks to Steve Ochs for this information. ]

yea, that's what I meant to say... :D