holley spred bore
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holley spred bore

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    Senior Member 1975sleekcraft's Avatar
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    Default holley spred bore

    i just bought a holley 800 dp. the list # is 6213. the butterflies have small primaries and huge secondaries. is anyone familiar with these holleys??

    is this carb suitable for my olds 455 with 10-1 compression, 280 comp cam, edlebrock performer intake, and a fresh 3 way grind an my heads(i am guessing 450 horse)??????

    some of you know i mushroomed 4 intake valves, thats why the fresh heads!!

    i have been told plenty of reasons why my engine sucked 4 intake valves. i am trying not to have this problem again. one reason, lean burn on wot.
    i was running a holley 650dp, i was told to step it up to the 750 to 850 range.
    so in my infinate wisdome i chose an 800. not knowing much about carbs i bought a spred bore?????????
    is this good????
    or is this bad???????

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    Senior Member 2002CP19's Avatar
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    Quote Originally Posted by 1975sleekcraft View Post
    i just bought a holley 800 dp. the list # is 6213. the butterflies have small primaries and huge secondaries. is anyone familiar with these holleys??

    is this carb suitable for my olds 455 with 10-1 compression, 280 comp cam, edlebrock performer intake, and a fresh 3 way grind an my heads(i am guessing 450 horse)??????

    some of you know i mushroomed 4 intake valves, thats why the fresh heads!!

    i have been told plenty of reasons why my engine sucked 4 intake valves. i am trying not to have this problem again. one reason, lean burn on wot.
    i was running a holley 650dp, i was told to step it up to the 750 to 850 range.
    so in my infinate wisdome i chose an 800. not knowing much about carbs i bought a spred bore?????????
    is this good????
    or is this bad???????
    I believe they were for smog applications, and it is a direct Q-jet replacement. It's not a performance carb, but it should work for ya. That 455 probly came with a Q-jet from the factory.

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    460
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    I ran this on my motor for a year. BBF 9.5 to 1 and it worked fine. Ditched mine because the rebuild kit is outragous expensive. It got to the point where it was draining the fuel out of the bowl making it a bitch to get started. Other then that it was a decent carb. Still have it on the shelf at home incase

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    Senior Member H20MOFO's Avatar
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    Seems like the spread bore carbs need a spread bore manifold. For some reason I thought all the spread bore holleys were like 650ish.
    Another Hot Boat refugee

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    Senior Member 2002CP19's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Seems like the spread bore carbs need a spread bore manifold. For some reason I thought all the spread bore holleys were like 650ish.
    They make an adapter plate and it serves as a 1" spacer also.

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    AKA OhOneWS6 Last Mohican's Avatar
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    Search some of the car boards. There are a lot of people who love those spread bore Holley's. The only real complaint I have ever heard about them is the float is not externally adjustable on the 6210 (650). Got any pics of it? Is it new or used? That performer intake is setup for both spread and square bore carbs. It should bolt right on. The 6213 is a performance carb. It is not an OEM replacement for a Q-jet.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by 1975sleekcraft View Post
    i just bought a holley 800 dp. the list # is 6213. the butterflies have small primaries and huge secondaries. is anyone familiar with these holleys??

    is this carb suitable for my olds 455 with 10-1 compression, 280 comp cam, edlebrock performer intake, and a fresh 3 way grind an my heads(i am guessing 450 horse)??????

    some of you know i mushroomed 4 intake valves, thats why the fresh heads!!

    i have been told plenty of reasons why my engine sucked 4 intake valves. i am trying not to have this problem again. one reason, lean burn on wot.
    i was running a holley 650dp, i was told to step it up to the 750 to 850 range.
    so in my infinate wisdome i chose an 800. not knowing much about carbs i bought a spred bore?????????
    is this good????
    or is this bad???????
    There is nothing wrong with that carb for your'e app. Get a jet size and squirter size to me and I will direct as best I can and please do it on a P.M. I just sold a newer version 650 spread bore to sandeggo also on the boards and he picked up 5 MPH and it idles like a kitten. If you have questions ask him as to how my tuning works. I do it on a P.M. mode cause I don't want to hear crap from others!!! I have rebuilt and tuned more carbs than most people have seen. M

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    Senior Member 1975sleekcraft's Avatar
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    Quote Originally Posted by Fo Sitty View Post
    Ditched mine because the rebuild kit is outragous expensive.
    no kidding, i went to action autoparts today and they want $130.00 for the kit!! went online and jegs wants $80.00

    i am just concerned that the primaries will run lean(not enough cfm)??????????

    should this be a concern of mine????

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    Senior Member sandeggo's Avatar
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    bolted it on and ran it. had to turn the idle screw a 1/4 turn to get my smallblock purring. the carb i bought was off a bbc

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    Will not run lean, your low end will be snappy because of the smaller primaries. I think the carb. will work great for your application.

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    Quote Originally Posted by 1975sleekcraft View Post
    no kidding, i went to action autoparts today and they want $130.00 for the kit!! went online and jegs wants $80.00

    i am just concerned that the primaries will run lean(not enough cfm)??????????

    should this be a concern of mine????
    I never had an issue with mine. Ran the shiot out of it and it responded well.

    You will have plenty of snap on the primary side and it will open up a good on the big side. Its probally gunna work just fine for what your doing

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    Senior Member 1975sleekcraft's Avatar
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    Default power valve

    i want to run just jets without power valves.
    so there are no suprises, just straight forward!!
    does anyone see a problem with this??
    i have never ran this carb on my boat!
    4165 series, list 6213
    right now it has 64 jets and an 85 power valve on primaries,
    and 85 jets with a 65 power valve on the secondaries!!
    25 squirters on prime and 37 squirters on seconds

    any help or knowledge will be great!!

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    Senior Member CK7684's Avatar
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    Had one on my Dodge van...worked good for me...

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    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by 1975sleekcraft View Post
    i want to run just jets without power valves.
    so there are no suprises, just straight forward!!
    does anyone see a problem with this??
    i have never ran this carb on my boat!
    4165 series, list 6213
    right now it has 64 jets and an 85 power valve on primaries,
    and 85 jets with a 65 power valve on the secondaries!!
    25 squirters on prime and 37 squirters on seconds

    any help or knowledge will be great!!
    Power valves are not necessarily a bad thing. IIRC a good stating place is to go up 2 (Scratch that. It's more like 6 to 8) jet sizes if you decide to block off the power valve. Without having tuned that carb to your application, you are starting blind. I'd check out Holley's site. There is a lot of good basic tuning instruction there.

    From Holley:
    the power valve selected should be 1/2 the intake manifold vacuum reading taken. EXAMPLE: 13” Hg vacuum reading divided by 2 = 6.5 power valve. If your reading divided by 2 lands on an even number you should select the next lowest power valve. EXAMPLE: 8” Hg vacuum reading divided by 2 = 4 power valve. Since there is no #4 power valve you should use a 3.5.

    There still seems to be a lot of misconception about Holley carburetors blowing power valves. Nothing could be further from the truth. Holley performance carburetors built since 1992 have utilized a power valve check system that effectively eliminated this infrequent problem.

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