Author Topic: found very odd carb: late style APT and divorced choke ?  (Read 1342 times)

Offline Frank400

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found very odd carb: late style APT and divorced choke ?
« on: March 24, 2014, 03:42:29 PM »
Just bought an engine (69 GTO YS) and on it is a 17057255.  It is an Oldsmobile carb but just can't find the exact application.  It has a divorced choke and a late model (the good one !) APT system. 

  I measured it and found very odd numbers:

main air bleeds: upper in air horn: .070", lower in main body: .028", yes .028" ???
main jets: 73
primary metering rods: 49k (.026" tip)

idle air bleeds: upper: .070", lower: .070"
idle tubes: .034"-.035" (.033" bit goes in easy, .036" won't go)
idle channel restriction: .039"
idle discharge at screws: .089"
idle air bypass: none

secondary rods: CV
hanger: M

   what do you guys think ?  pretty strange main air bleed (.028"), .039" idle channel restriction (not a lot bigger than idle tube ?)

  I'm thinking this carb could be very nice looking on an old car because of the divorced choke, kind of best of both worlds ?

  Frank.

Offline Ethan1

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Re: found very odd carb: late style APT and divorced choke ?
« Reply #1 on: March 24, 2014, 03:54:12 PM »
 That carb was on the '77 Olds Delta 88 350cid A/T Non-A/C. Stock specs were .073" Primary Jets, 49K Primary Metering Rods, "K" Secondary Hanger and CV Secondary Metering Rods.
Ethan

1972 Chevelle

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Offline Frank400

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Re: found very odd carb: late style APT and divorced choke ?
« Reply #2 on: March 24, 2014, 04:44:08 PM »
It's the divorced choke that amazes me the most, as well as the ultra small main air bleed and kind of small idle down channel restriction...

Offline Ethan1

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Re: found very odd carb: late style APT and divorced choke ?
« Reply #3 on: March 24, 2014, 06:12:27 PM »
It's the divorced choke that amazes me the most, as well as the ultra small main air bleed and kind of small idle down channel restriction...

 Well, you were curious about what it came in, so I gave it to you.
Ethan

1972 Chevelle

(oo______oo)