Quadrajet bolts

[HK1837]

You only need 2 x bolts. Other 2 are studs and nuts (studs will still be in your manifold). Part number was 188154 for the bolts. GMH may still have them new. If you get stuck I can get exact dimensions and threads for you of the bolts. Studs were part number SP3046. The part numbers are WB, as they are the most likely to be still around, but only the stud's part number changed - used to be SP1763.

I just found this too: Quaddy bolts were 5/16" - 18 x 3.75". Studs were 5/16" x 1.54" (also same as red 253). Nuts for studs were 5/16" - 24.

Someone can correct me if wrong, but I think for the bolt it means 5/16" thread size, 18TPI, 3.75" long.