1986-1987 Production Heads 3.8 Liter

Casting number 25518445

TOP

COMBUSTION CHAMBER

Features of Note:

Notice the typical Buick shaft mounted rockers
Notice valve cover bolts on the outside rails vs. center holes in FWD covers
Cast number (red oval)

Features of Note:

Notice the four bolt holes per cylinder
Notice the bridged water passages at the end of the head decks

EXHAUST SIDE

INTAKE SIDE

Features of Note:

Square exhaust ports

Features of Note:

Tall retangular intake ports
EGR provision in the center of the head

TOP	COMBUSTION CHAMBER

Features of Note: Notice the typical Buick shaft mounted rockers Notice valve cover bolts on the outside rails vs. center holes in FWD covers Cast number (red oval)	Features of Note: Notice the four bolt holes per cylinder Notice the bridged water passages at the end of the head decks
EXHAUST SIDE	INTAKE SIDE

Features of Note: Square exhaust ports	Features of Note: Tall retangular intake ports EGR provision in the center of the head

Submitted by:

Ken Mosher