7/9/04 OOps!! Forgot to delete the tailings, so here it comes again. Dave K.
7/8/04
Larry and the lists,
I had always assumed that all BOP 4-barrel intake manifolds were
the same--obviousoly not so!! I checked the 3 I have already removed from
engines:
1) Casting number 1349520 / diameters are about as you specified.
2) Casting number 581830X / diameters are about as you specified.
3) No casting numbers or other marks / diameters about same as 581830X.
4) 2 more still on engines with carburetors mounted and in cars, 1
'61 Olds F-85 and 1 '62 Olds F-85 / Both are number 581830X / Of course
cannot see bore size but no reason to suspect any different from others of
same casting number.
5) My original 1964 Oldsmobile factory parts book shows part number
581830 is for 1961 and 1962 4-barrel carb F-85 / 1963 4-barrel carb calls
for part number 381575 (bore diameters unknown).
6) My conclusion is that 1349520 is probably Buick version, though
don't know what year application.
Hope this doesn't muddy the waters too much.
Cheers,
David Kernberger
----------------------------------------------------
>I have a couple of GM stock 4bbl intake manifolds that fit the 215/3.5
>aluminum V8.
>
>Each has four intake holes on the top; but one of them has smaller primary
>holes and smaller secondary holes than the other. When I compare the
>intakes with the venturi holes on a Carter 400 and a Edelbrock 500 carb;
>even the intake manifold with the smaller intake holes has larger holes than
>the carb venturi holes. (are you still with me here? Even if I got all that
>right you might need to read it twice!)
>
>Are there any advantages of the manifold with the larger holes; or perhaps
>the manifold with the smaller holes?
>
>Does anyone know why there is a difference? What they may have come off of?
>
>Thanks in advance,
>
>Larry Hoy
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