455 Olds Carburetor Question. Can you identify this part?
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455 Olds Carburetor Question. Can you identify this part?

  1. #1
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    Default 455 Olds Carburetor Question. Can you identify this part?

    Hey everyone total newbie here so go easy, I picked up a 77 Carribean today with a 455 olds. The boat did start but im pretty sure the carb needs to be replaced, along with a bunch of other parts like this one. It looks like someone took some plumbing parts out of an AC van and made this. What is it and what do I need to do to get rid of it? Any helps is appreciated!Click image for larger version. 

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    Also, this boat has a mechanical fuel pump, is this the port where the stock mechanical fuel pump woud go? Thanks!
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  3. #2
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by jb1314 View Post
    Hey everyone total newbie here so go easy, I picked up a 77 Carribean today with a 455 olds. The boat did start but im pretty sure the carb needs to be replaced, along with a bunch of other parts like this one. It looks like someone took some plumbing parts out of an AC van and made this. What is it and what do I need to do to get rid of it? Any helps is appreciated!Click image for larger version. 

Name:	20150420_171658_resized.jpg 
Views:	173 
Size:	288.8 KB 
ID:	718849Click image for larger version. 

Name:	20150420_171717_resized.jpg 
Views:	123 
Size:	297.6 KB 
ID:	718857

    Also, this boat has a mechanical fuel pump, is this the port where the stock mechanical fuel pump woud go? Thanks!
    Click image for larger version. 

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    Hello and welcome to PB and Jets , the one pic is indeed where the mechanical pump once was , and God only knows what the extra tall Oil sender guage deal is however given Olds 455 inherent oiling issues suspect someone was carefully monitoring the engine oil pressure , the carb looks like its likely a Holley legacy series or ?? for Quadra jet replacement ? but cant see well , more pics more info would help Tom
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  4. #3
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    Thanks for the welcome Tom! Here is some pics of the carb. The good ol google search says its a 650 Spreadbore carb. I dont know much about this but Im thinking a 650 is too small for that motor. Is this carb worth anything or worth rebuilding? I am thinking about getting a new 750 and be done with it. Thanks for the help so far.

    Also, the oil sender thing, I noticed it seems like there is now right or wrong to mount the sender. I am goint to put in a new tube with a 45 degree elbow to angle the sender away from the block. Am I on the right track here. Thanks again.
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  6. #4
    Senior Member Texgo's Avatar
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    I would be afraid of that tube cracking or breaking from vibration. Curious why it's facing backwards.
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  7. #5
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    I looked in my oldest Holley catalog and could not get a listing for that carb. HOWEVER , Holley soon dropped from their line, as it was their worst performing carb series. the design is now being marketed by Summit as a Summit carb. Get rid of that Hi-Riser O/P gauge. It 'ill cause grief sooner or later. A classic 3310-XX will get he job done, AND many people can tune it , and there OEM and aftermarket parts galore should the need arise.
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