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need some inpu uys

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wraenking, Sep 10, 2003.

  1. wraenking

    wraenking 1/2 ton status

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    Toms River, NJ
    i am switching to a 400 sb soon, and want to know what you guys recommend as far as headers, exhaust, and a carb. the engine has a carb on it now, but it is a double pumper, and with the gas rates, i really dont want to keep it on there.'

    thanks for any input!!
     
  2. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    portland oregon
    carb go with a edelbrock or quadrajet 600-650cfm headers are always good and for exhaust go with true duel 2.5in /forums/images/graemlins/thumb.gif
     
  3. SUBFAN

    SUBFAN 1/2 ton status

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    Quadra Jet, 750 - 795 cfm, the 400 wants to breathe more than that 305 did....Street application? Build it mild? Use the 1 5/8 headers, your 400 will thank you.....BTW, that's typically not a very fuel efficient engine....
     
  4. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I just finished my 406 buildup back in february and I went with: 4.155"bore(.030over) 406 block, 9.2:1 compression pistons, 5.65 rods(stock), stock crank, larger valve factory head with 1.94 intake and 1.75exhaust, ported, Edelbrock performer intake, edel. perf. q-jet 795, HEI with summit coil, doug thorley tri-y headers, dual 2.5"pipe,dual 40 series flowmaster mufflers, dual 5" tips. Mine is good for at least 350HP with lots of torque.
    I am going to add the Edelbrock pro flow multi point EFI, maybe 1:6 roller rockers and a distant maybe 4" stroke crank to make a 434ci torque monster. /forums/images/graemlins/thumb.gif

    Oh, yeah and for fuel mileage with a 400, you'll think your feeding 2 stock 305's. /forums/images/graemlins/eek.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/tongue.gif

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    85K5 3/4ton, 14boltFF,10bolt, 9"lift,35"boggers,16.5x14 welds, big horse 406SBC/700R-4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     

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