750/850 Trick Final Part

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  • Опубліковано 30 лис 2024

КОМЕНТАРІ • 109

  • @PeggyParrow
    @PeggyParrow Місяць тому

    Im a machist, on the primary side, i would drill the plate, and tap it for a small allen plug to have an adjustable set up for the primarys on the top of the plate, i also remove the adjustment screw on the secondarys on the older holleys, and put it in from the top to keep from having to remove the carb to fine tune the secondarys .Hope this helps.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Місяць тому

      Yes and they make a nice aftermarket bracket for the 4150 dp secondary idle adjustment too. Take care

  • @MattCorrie-n9f
    @MattCorrie-n9f 18 днів тому

    thank you - subscribed. I've always wondered how you replace boosters and how do you know when you should? thanks again

  • @tonydee761
    @tonydee761 Рік тому

    Thank you very much sir.👍

  • @barrykilts4506
    @barrykilts4506 Рік тому

    I appreciate your teaching video’s,I’ve been off my feet and away from my project for yrs but am getting them under me again and you’re going to be so much help to me,,thanks

  • @tonydee761
    @tonydee761 2 роки тому +7

    Hello Randy, & again beautiful job at explaining & actually doing the work on the fly to show us how it's done. Liked that you showed the other baseplates with the 4 corner & 2 corner idle. As always keep pulling some more stuff out of your sleeves. Thanks a bundle brother.

  • @threadtapwhisperer5136
    @threadtapwhisperer5136 2 роки тому +2

    Man, i appreciate you taking the time to explain the best organized fuel leak engine management systems ever to bless a high rise Super Victor intake.

  • @mikecondoluci53
    @mikecondoluci53 Рік тому

    GREAT VIDEO RANDY, DO YOU HAVE ANY TRICKS FOR 600 HOLLEYS IM PUTTING A PAIR ON A TUNNEL RAM

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      Start at high velocity holley part one on the list#1850 always ad alot of accelerator pump shot for a tunnel ram, as always let me know if you have any questions. Good luck.

    • @mikecondoluci53
      @mikecondoluci53 Рік тому

      @@holleycarbshowtosadvice40y90 ok thank you

  • @TheBigstrat
    @TheBigstrat Рік тому

    Hi Randy
    After modifying everything
    Do you put the 850 gasket on as is
    Or can you lengthen the idle hole on the 750 or 850 gasket

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      I lay the 850 gasket on the 750 main body and line it up carefully and center punch the 850 idle holes on your 750 main body then remove gasket drill a hole where you center punched the 850 idle hole .060 deep remove the gasket and then carefully cut a little passage joining the two holes on the 750 main body and your done. Hope this helps. If your not sure about any mods watch my video. 750/850 trick final part.

  • @djrowe10
    @djrowe10 Рік тому

    Glad you finally got around to making this video 2 years after you said you would. I actually made a video last year to show how to do this because you didn't make this video like you said you would. Better late then never...
    Not sure why you aren't saying this makes a classic 950 holley with 830cfm? 😮

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      I know its a good piece, but not sure it flows 950 cfm but makes a great carburetor. Sorry for the delay .

  • @stevendiemer2833
    @stevendiemer2833 Рік тому

    Im a 4x4 pickup looking for lots of low end grunt could you use a 650 body and a 850 plate ........ 350 chevy large cam and heads

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому +1

      Ok throttle bore is the same size on 650 to a 800cfm, venturi size are different but you can modify a 650 body to fit a 850 plate but this is for racing only. Now if you won't bottom end power you don't won't to run a big cam and you may won't to advance the smaller cam but you have to check your valve to piston clearance when you advance the cam the intake valve gets closer to the piston, but it is a good way to build bottom end power and a dual plane intake. Hope this helps.

    • @stevendiemer2833
      @stevendiemer2833 Рік тому

      @holleycarbshowtosadvice40y90 very much so thank you

  • @340dakota6
    @340dakota6 Рік тому

    Randy, new subscriber, just found your channel, appreciate your expertise! 1 question, I am doing this exact conversion, but accidentally went too wide on one Venturi (unfortunately a very small step from Venturi to base plate). Can I use J B weld or other epoxy, or just buy another main body and start over? Thanks I appreciate your advice!!

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      I believe I would start over, unless your talking maybe .005. There's not much material between the barrels of the 850 throttle plate to seal the gasket. i don't believe jb weld would last. To me its better to be slightly smaller than to large. Take care.

    • @340dakota6
      @340dakota6 Рік тому

      Thanks Randy, I’ll go ahead and buy a new main body. Otherwise I would worry that a piece of epoxy might come loose and go through the motor. Appreciate your help… no education is free lol… we all pay! When you do the grinding, do you consistently put the base plate back on and check to make sure you haven’t gone too far? What the best way to achieve the 1.75” width? Thanks so much!

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      I use a medium grit flapper wheel and yes I constantly keep refitting the throttle plate to the main body. Take care.

    • @340dakota6
      @340dakota6 10 місяців тому

      Randy, thank you so much for the feedback. Okay I got everything completed as your video describes. On the motor, now I’m having a new issue. When on the motor and I rev it say to 4000, the blades close and it stays at that rpm??? It’s like it’s getting fuel under the blades somehow. I wonder if the power valve is blown out… have you ever encountered this issue with the 750/850 conversion? Thanks again for any help you can provide Randy!! Chris

    • @340dakota6
      @340dakota6 10 місяців тому

      I did notice on the new 850 plate there are open power valve vaccuum holes on both primary and secondary. The old 750 plate had a hole for primary, but it looks plugged. Wondering if that’s contributing to the issue..

  • @tonydee761
    @tonydee761 Рік тому

    Hey Randy what size flap wheel did you use to enlarge the 750 main body bores? I don't want to go too big. Let me know please & thanks..

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      Tony mine is a 60 grit, the size is rubbed off I believe its a 17/8 but not sure I remember i had to wear it down some before i could use it. I think 100 grit would be better, and I keep rechecking the fit between the two bodies and take my time its better to be a little on the small side than to big. I always try to match them as perfect as possible.hope this helps.

  • @20havenfun08
    @20havenfun08 2 роки тому +1

    Thanks Randy:)
    Learn so much from your videos...

  • @inscoredbz
    @inscoredbz 9 місяців тому

    You have to open up the main body because the throttle blades won't open all the way if you don't, correct?
    Where would you even start on jetting and all that jazz? Do you try to copy a hp950 for initial settings?
    Is that a procomp/speedometer base plate?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  9 місяців тому

      Yes the throttle bore needs to be blended to match the 850 throttle plate to improve the flow and increase velocity. I ended up with a 72 jet primary with power valve and a 78 jet secondary with the secondary power valve blocked. But can differ from engine to engine.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  9 місяців тому

      When I started doing this mod about 40 years ago, I did not know holley made their 950 to these specs . I'm not sure that this will flow 950 cfm I believe its closer to 800 to 850cfm. Thanks for watching.

    • @inscoredbz
      @inscoredbz 9 місяців тому

      @@holleycarbshowtosadvice40y90 the Holley flows 820 cfm, I'm wanting one of these for a 383. AED sells one for $760 bucks, but dang, I don't have that kind of cash. That's almost half of an efi kit.

  • @hectorortega9131
    @hectorortega9131 2 роки тому

    Hello, What do you think about holly Center Squirter carb for strip street use?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      Its not the best carburetor for the street and the secondaries are mechanical and open one to one, most came with straight leg boosters and back in the day most people raced them with a manual 4 speed, not a bad carb and with some mods can make a good all out drag racing carb. Fuel mileage would be terrible on the street. Thats about it.

  • @alexandermajarrez994
    @alexandermajarrez994 Рік тому

    Hi randy , love the information. What epoxy do you use 🤔?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому

      I use jb weld on most mods. There is a better epoxy its green in color, don't recall the name let me know if need it.Thanks for watching.

  • @blubu68
    @blubu68 Рік тому

    Hey Randy, what did you use to hone the main body?

  • @Anarchy-Is-Liberty
    @Anarchy-Is-Liberty Рік тому

    You didn't link to the throttle body!

  • @stuartcookie133
    @stuartcookie133 2 роки тому +1

    Something else about the chinesium base plates...No power valve blow out protection.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      I don't use the power valve ball check in my race engines any way, the plate is machined well the one thing we changed was the accelerator pump arms. Thanks.

  • @CLC496
    @CLC496 2 роки тому +1

    Thank you for this information good to see someone who shares. I don't see the link for the base Thank you

  • @SAM-eg7jg
    @SAM-eg7jg 2 роки тому

    This is so Awesome...!

  • @peggyparrow2059
    @peggyparrow2059 2 роки тому

    My hubby uses a taperd tool called a bowl hog thats used to remove metal from valve pockets in heads.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      Sounds like he's got the right tools. You just can't have to much equipment or tools. Have a great day.

  • @Hamrake
    @Hamrake Рік тому

    Great content, Randy
    Would you still drill out the plates on that proform baseplate to improve control of the idle circuit?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  Рік тому +1

      Yes, if it needs the extra air. When I drill the plates its because of low vacuum conditions. So if i can't set the transfer slots where they need to be then I will drill the plates to bypass air, that will raise the idle where I can then readjust the idle speed screw lower to close the transfer slots, always start with small holes maybe .080 until you have the transfer slots set proper. Hope this helps.

  • @peggyparrow2059
    @peggyparrow2059 2 роки тому

    First, spray carb with blue dychem, let it dry, hold gasket on carb, use a pointed tool and scribe the lines on carb. It will keep you from making the holes to big.

  • @jeffkarker8693
    @jeffkarker8693 5 місяців тому

    Can you install some boosters in mine?

  • @Project-uy3hb
    @Project-uy3hb 2 роки тому +2

    Howdy
    Might want to check the butterfly screws. Make sure they have loctite or staked. Just sayin ✌

  • @ralphparker9263
    @ralphparker9263 2 роки тому +1

    Good stuff I sure like it

  • @DeusTex-Mex
    @DeusTex-Mex Рік тому

    Are you from Kentucky? Your accent sounds like my relatives.

  • @mickangio16
    @mickangio16 2 роки тому +2

    Hi, Randy. I am a fan of your knowledge. I kinda miss your two foot long screwdriver😁 It would be great to see one of your works of art in service.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      Mick I'm not sure, but I think we are going to run my friends race engine on a engine run stand, this will have the modified 750 holley off my latest video. Thanks for watching.

  • @billjacobs8035
    @billjacobs8035 2 роки тому +1

    As always,many thanks!

  • @maddmikesmotorsports8909
    @maddmikesmotorsports8909 2 роки тому

    Great video's I'm thinking about switching to methanol on my fox body LS swap. I have a little 6.0/365 Dart heads was EFI switched to a Braswell 4760 carb on a super victor . Just interested in a setup fuel wise and trying to get hw much my car will pick up. I'm running in the 6.70-80s right now.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      Mike our motor felt like it picked 35 to 45 hp with an old 355sbc never had it on a dyno, but you could definitely feel the power. Braswell carbs are probably one of the best carburetors,if not the best. I would check with them if your converting to alcohol, only bad thing about alcohol is the corrosiveness.hope this helps

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      Mike most carbs are about 2.2-1 alcohol compared to gas, usually you have to change boosters, metering blocks an needle and seats. Good luck.

    • @maddmikesmotorsports8909
      @maddmikesmotorsports8909 2 роки тому

      @@holleycarbshowtosadvice40y90 Sorry replied to wrong video

  • @413x398
    @413x398 2 роки тому +1

    Sorry, I missed how and why you bored the body out. Link?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      I have a fine textured flapper wheel i use with my die grinder slightly larger than the lower bore of the carb body and slowly and carefully match it to the plate bores, I'll look an see if I can find the vid. Hope this helps.

  • @the.happy.mechanic
    @the.happy.mechanic 2 роки тому

    I just watched this video I would have never guessed that was possible, I'm impressed wich is hard to do, have you tried it with any of the throttle body efi setups that kinda mimic the holley carb setup look, the efi that when a aircleaner is on at a very quick glance looks like a holley like quick fuel or professional products or Fi-tech or even the holley terminator efi, say like the wrong size one that's been kicking around the shop for while, for example I have one from quick fuel that my brother had on his 1969 mustang wich has a 302 in it, I was wanting to put it on a lower than 600 hp 454 I'm guessing it's at 525 to 600 range. I didn't use it as we all know it's to small but then I saw this viedo. Right now I'm going to use a tunnel ram and some re-tuned to match the horse power edelbrock 600cfm carbs sideways mounted. But if I could make the modifications you did I might go that way instead.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      The only way we learn is by thinking studying and modifying new ways of doing things, I still get excited modifying carbs and parts. I haven't tried it on efi.

    • @the.happy.mechanic
      @the.happy.mechanic 2 роки тому

      @@holleycarbshowtosadvice40y90 maybe someday I'll try it and find out. I have another car I'll use it on for a while while I make up my mind. Thanks for responding and thanks for that video I figure it should be the same if I put a larger throttle plate on it after I modify the main body I think it's a 600 or 650 cfm throttle body so I was thinking of up grading it like you did but to a 700 or 750 cfm.

  • @TheBigstrat
    @TheBigstrat 2 роки тому

    Hi Randy
    I think Proform #67156 make a throttle plate where the idle and transfer slot holes match the 750 body
    But it’s more expensive than the one your friend bought
    So I guess if the holes match up
    Only the Venturi needs opening up to 1.75
    Thanks Bluey

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      The only problem we have is the gasket. If I taper the main body to 1.750 to match the 1.750 throttle plate then I would have to trim the 750 gasket to the 1.750" I believe that will be tough to do, holley had a gasket years ago , this would be a nice deal if they offer the correct gasket. Maybe proform will offer it. Thanks for the information.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      If I can get the right gasket, then like you said all that would be left is tapering.

  • @jerrygarner8566
    @jerrygarner8566 2 роки тому +1

    Thanks Randy can't wait to see how it works

  • @gregvanderboom5011
    @gregvanderboom5011 2 роки тому +2

    Hi Randy, I know you're a Holley guru, but what are your thoughts on the Summit Racing copy of the autolite 4100 carburetor? A lot of folks say that carb is manufactured by Holley. With it's anular boosters, serviceable jets at all four corners, and serviceable restrictors for the bleeds I believe it should perform very good. Maybe that would be a good video for you to do. Thank you for the video. I appreciate you.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +2

      I've worked with the 4100s back in the day and that was a great carburetor, one of the few carbs i use to run with the top off to watch the float levels at idle, great carb. I'm not for sure but l believe motor craft made it. I always liked what we called the cluster booster. Great carburetor and very dependable carb. Brings back old memories. Greg I'll look and see if have one. Thanks

  • @TheSaxon25
    @TheSaxon25 2 роки тому +1

    Thanks brother! Hey do you need a special tool to remove those boosters? 🍻

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      Hey bud good to here from you, Saxon i match the new booster to a flat punch, the punch being slightly smaller than the booster and drive it out, they might make a special tool but the punch works good, the main thing is to swedge the booster in tight. Later brother.

    • @TheSaxon25
      @TheSaxon25 2 роки тому

      @@holleycarbshowtosadvice40y90 Roger that good buddy. That about what I was thinking. You have any videos on mixing booster types for targeted performance?? Always look forward to anything you put out 🍻

  • @tonydee761
    @tonydee761 2 роки тому

    Hey Randy by any chance you got a good used 850 vacuum secondary baseplate with 2 corner idle? Just the baseplate, let me know sir.

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      I'm sorry wish I had one, as my channel grows hope to start carrying some parts. Have a great day.

  • @eastendcustoms777
    @eastendcustoms777 2 роки тому

    Can I turn my 4 corner 650 Holley double pumper mech secondarys into a 2 corner

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      Yes change your rear metering block back to a non adjustable one. The idle passages aren't completed. Hope this helps.

    • @eastendcustoms777
      @eastendcustoms777 2 роки тому

      @@holleycarbshowtosadvice40y90 thank u for the info look forward to more videos

  • @richardschafer1911
    @richardschafer1911 2 роки тому

    Loved it got my subscription can't wait for more information just curious do you do delortos as well if so would love to see something on modifying some sidedraughts

  • @Darrenlawrence89
    @Darrenlawrence89 2 роки тому

    This is sort of off topic but not really covered,
    My stock metering block has the accelerator pump transfer tube and my qft adjustable one doesn’t ,, can I run the new gasket and be safe or is there something I have to do to the carb side to run my non transfer tube style metering block ?

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому

      I need you list number off your carb. Also which gasket are you talking about using. 4150 4180 4160.

    • @Darrenlawrence89
      @Darrenlawrence89 2 роки тому

      @@holleycarbshowtosadvice40y90 my carb is a vacuum secondary 390cfm my stock metering block has the accelerator pump transfer tube , pipe that goes off metering block with oring gasket that inserts in the carb body ,,,,, the metering block I wanted to replace it with was a qft -34 because it allows me to make adjustments with air bleeds but it doesn’t have the transfer tube like my stock one has ,,, thinking maybe the metering block gasket will cover where the transfer tube goes in and I’d be fine but I want to know before hand , apparently this hasn’t really been discussed anywhere carb number is 08007

    • @holleycarbshowtosadvice40y90
      @holleycarbshowtosadvice40y90  2 роки тому +1

      Arron good question, I've never really looked carefully at the transfer tube position, looks like it could be made to work, but its not a direct interchange, I'm looking at a 4180 style holley should be simular to yours. The transfer tube hole is recessed in the main body, but if you modify the transfer tube its possible, you would use the regular 4150 style metering block gasket. Hope this helps.

    • @Darrenlawrence89
      @Darrenlawrence89 2 роки тому

      @@holleycarbshowtosadvice40y90 thanks I was trying to see if qft made one so I can just exchange it for the one with accelerator pump transfer tube , if not then I might drill and see if I can convert it

    • @Darrenlawrence89
      @Darrenlawrence89 2 роки тому

      @@holleycarbshowtosadvice40y90 hey randy I got it figured out , used a drill press to make the insertion for the transfer tube , working as it should !

  • @RW-kd4gxwhiteshaddow
    @RW-kd4gxwhiteshaddow 2 роки тому

    Yee-hawh 👍

  • @genemanno1533
    @genemanno1533 2 роки тому

    You make me cringe when drilling with hand drill holding piece in your hands. Why not secure piece in a drill press and get a cleaner straight and square hole. Otherwise nice presentation.

  • @justpray365
    @justpray365 2 роки тому +2

    You know the good Lord let man invent the vise so that he can hold things steady when doing this kind of work.