Engine Assembly for 1977 Pontiac Sunbird

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There are 14 choices for the 1977 Pontiac Sunbird Engine Assembly !!!
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PONTIAC 6 Cyl, 231 cid VIN A (5th digit, even firing)
PONTIAC 6 Cyl, 231 cid VIN C (5th digit, uneven firing)
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, 305 cid
PONTIAC 8 Cyl, 350 cid VIN P (5th digit)
PONTIAC 8 Cyl, 350 cid VIN R (5th digit)
PONTIAC 8 Cyl, 400 cid
PONTIAC 8 Cyl, 403 cid
SUNBIRD 4 Cyl, 140 cid
SUNBIRD 4 Cyl, 151 cid pulsair (VIN 1, 5th digit)
SUNBIRD 4 Cyl, 151 cid Without pulsair
SUNBIRD 6 Cyl, 231 cid VIN A (5th digit, even firing)
SUNBIRD 6 Cyl, 231 cid VIN C (5th digit, uneven firing)