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10-08-2015, 10:33 PM
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Carpe manana
  
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,449
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Educate me: Differences in BB exhaust manifolds for 71-72?
I've noticed two styles (borrowed pics below) of exhaust manifolds for 71-72 BB engines. One style has contiguous metal spanning adjacent ports (top pic), the other has no intervening metal between adjacent ports. Were both styles used on pickups? My 72 BB has the "contiguous" style and I believe these are original to the truck.
I'm looking at a spare set that is "discontinuous". The RH has part # 3989310 (looks correct for 402 or 454 passenger car) and the other looks like # 3914619 (couldn't locate application). Would these differing styles be interchangeable in a pickup? Thanks, Pete
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308  Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
Last edited by DeadheadNM; 10-08-2015 at 10:35 PM. Reason: Clarified point |
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