Engine Assembly for 1978 Pontiac Firebird

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There are 14 choices for the 1978 Pontiac Firebird Engine Assembly !!!
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FIREBIRD 6 Cyl, 231 cid (3.8L, VIN A, 5th digit)
FIREBIRD 8 Cyl, 301 cid (4.9L) VIN W (5th digit)
FIREBIRD 8 Cyl, 301 cid (4.9L) VIN Y (5th digit)
FIREBIRD 8 Cyl, 305 cid (5.0L)
FIREBIRD 8 Cyl, 350 cid
FIREBIRD 8 Cyl, 400 cid
FIREBIRD 8 Cyl, 403 cid
PONTIAC 6 Cyl, 231 cid (3.8L, VIN A, 5th digit)
PONTIAC 8 Cyl, 301 cid (4.9L) VIN W (5th digit)
PONTIAC 8 Cyl, 301 cid (4.9L) VIN Y (5th digit)
PONTIAC 8 Cyl, 350 cid VIN R (5th digit)
PONTIAC 8 Cyl, 350 cid VIN X (5th digit, Buick)
PONTIAC 8 Cyl, 400 cid
PONTIAC 8 Cyl, 403 cid