63,64,65,66,67 Chevrolet Corvette  Intake Vacuum Fittings in intake manifold:

  #21-27A  vacuum intake fitting 64-67 power brakes only

  #21-27B  vacuum intake fitting  a/c OR  automatic 64 Late , 65,66,67

  #21-27C  vacuum intake fitting power brake and a/c
   *OR* power brake  & auto (except 3x2)

   #21-27D  vacuum fitting air conditioning and automatic

  #21-27E  vacuum intake fitting :   air cond and auto and power brakes (except Tri-power)

  #21-27F  vacuum fitting - plug -   #21-27G  vacuum intake fitting - power brakes & a/c 67 tripower
         *OR* power brakes  & auto (67 tripower)

  #21-27H  vacuum fitting power brakes & a/c & auto (67 3x2 tripower)

    #21-27J  vacuum fitting 63-65 power brake

#21-27K   FI plenum plug 63-65 FI and no power brakes

 #21-27L  Intake vacuum fitting - power brakes and a/c (4 speed and auto) 1964 (4pc)

 #21-27M  intake vacuum fitting - 64 late automatic (2 pc)

#21-27N  vacuum intake fitting 64 early -air conditioned (2pc)

#21-27P  vacuum intake fitting - power brakes -(use #21-27a)

 #21-27Q   FI vacuum  intake fitting- vacuum advance fitting 63-64

#21-27Rvacuum intake fitting - a/c and auto (67 Tripower)

 - see section 21 for schematic catalog page  Corvette Parts 63,64,65,66,67