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Thread: Small block exhaust manifolds

  1. #1
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    Small block exhaust manifolds

    I just learned something that might be useful. I am reinstalling a 1968 350 in my 1968 Skylark. I am using the 2-1/2 inch TA Performance down pipe. Due to other modifications, I am not using the stove nor the heat riser valve so I gutted the valve, plugged the shaft hole and bolted it to the flat flange on the bottom of the manifold. I did this because I needed the nipple on the bottom of the heat riser valve to accept the female flare on the top of the TA down pipe. I have another 350 laying around that I should have looked at sooner. Its blue with HEI and lots of emissions stuff but I don't know what it is out of. Anyway its manifolds are made opposite the 1968 versions. The left hand has the flat bottom flange and heat riser casting number B-1246669-1. The right hand is slightly longer than the 1968 version and includes the male nipple as part of the manifold casting number B-1246656-1. It would have made a cleaner installation had I used this one on the right side of my 68.

  2. #2
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    that's good to know, but it would apply to the 350 only.

    the 215, 300, 340 and Rovers are also in this family.
    The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
    Vladimir Lenin

    Government schooling is about "the perfect organization of the hive."
    H.H. Goddard, Human Efficiency (1920)

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    350 manifold

    True. 350 only. I believe the other small blocks 215 thru 340 use a different head layout with equally spaced exhaust ports. Not Siamesed on the centers like the 350.

  4. #4
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    yeah, they're actually siamesed on the center intake runners. their manifolds have a very "header" look to them.

    i normally refer to those as "Rover style".
    The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
    Vladimir Lenin

    Government schooling is about "the perfect organization of the hive."
    H.H. Goddard, Human Efficiency (1920)

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