Holly 750 Marine..NON DP
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Holly 750 Marine..NON DP

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    Default Holly 750 Marine..NON DP

    Hey Guys,

    I have a Holley 750 Marine carb on my 454bbc, its a 0-9015-1. Its not the double pumper. There's been a bunch of work done top it from JP Marine. The previous owner let it sit out and the carb was corroded pretty bad. We rebuilt the entire thing. The guy that rebuilt it said the squirters were drilled out larger, and it had some other grinding and epoxy work done to it, but I dont know if all of the corrosion has hurt it even though it was rebuilt. I dont remember what jets are in it.

    Would I notice a difference with a 750 double pumper and mechanical secondaries vs vacuum secondaries. Its sitting on a 20.5 Carrerra Elite with a Performer intake, and I know enough to know what to check or adjust, but I do know enough to get myself in trouble which is what I am trying to avoid. Would I notice a difference with a 750 double pumper?

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    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by headshothills View Post
    Hey Guys,

    I have a Holley 750 Marine carb on my 454bbc, its a 0-9015-1. Its not the double pumper. There's been a bunch of work done top it from JP Marine. The previous owner let it sit out and the carb was corroded pretty bad. We rebuilt the entire thing. The guy that rebuilt it said the squirters were drilled out larger, and it had some other grinding and epoxy work done to it, but I dont know if all of the corrosion has hurt it even though it was rebuilt. I dont remember what jets are in it.

    Would I notice a difference with a 750 double pumper and mechanical secondaries vs vacuum secondaries. Its sitting on a 20.5 Carrerra Elite with a Performer intake, and I know enough to know what to check or adjust, but I do know enough to get myself in trouble which is what I am trying to avoid. Would I notice a difference with a 750 double pumper?
    I have ran the same carb for 6 years...dp 750 vac secs...on a 455 and now a 460. Very happy
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    I have the almost exact setup as you. 20.5 Carrera Elite, 454, performer intake, 750 Edelbrock carb. I would be curious to see how your boat performs when you get the carb dialed in. I am only getting 4100 rpm right now.

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    Quote Originally Posted by Glider View Post
    I have the almost exact setup as you. 20.5 Carrera Elite, 454, performer intake, 750 Edelbrock carb. I would be curious to see how your boat performs when you get the carb dialed in. I am only getting 4100 rpm right now.
    Wow..only 4100 rpm...Im spinning 4500, and it turns an honest 52 mph with the diverter and 4 people in it. I posted in another thread about my compression test. From what I have been told the motor has never been rebuilt.

    My cousin has a 21ft Eliminator daycruiser, they are almost identical. He doesnt have a diverter, nor does he have a hi-rise intake manifold and hes running a 600cfm holley and hes turning 4700 rpm and a solid 52.1 mph on gps...

    We were thinking of pulling his 600cfm off to see if it could be a carb related issue.

    I do have an MSD Pro Comp Dizzy and Coil with mechanical advance. We still havent dialed in the advance yet, i finally marked off on the balancer 36*, but havent shot it with the light.

    As much as I would like to pull the trigger on a carb, i'd hate to blow 3-500 bucks on a whim. I wish I new more people or someone that had another carb laying around just to test...
    Last edited by headshothills; 05-24-2010 at 02:51 PM.

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    Quote Originally Posted by krusn56 View Post
    I have ran the same carb for 6 years...dp 750 vac secs...on a 455 and now a 460. Very happy
    I didnt see a Holley 750 DP with Vacuum secondaries, the only ones Im seeing are 750 electronic choke/vacuum secondaries or a 750 DP manual choke/mechanical secondaries.

    Is there an older one that made that way or do you have a different carb?

    Im kinda in the dark as far as Holley vs Edlebrock. Ive seen/read good and bad things about both. Im not bias towards either one, just want this thing to run and be solid.

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    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by headshothills View Post
    I didnt see a Holley 750 DP with Vacuum secondaries, the only ones Im seeing are 750 electronic choke/vacuum secondaries or a 750 DP manual choke/mechanical secondaries.

    Is there an older one that made that way or do you have a different carb?

    Im kinda in the dark as far as Holley vs Edlebrock. Ive seen/read good and bad things about both. Im not bias towards either one, just want this thing to run and be solid.
    I'm sorry...750 vac sec and electric choke...I was thinkin about my 850 dp on the shelf...my bad
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    Quote Originally Posted by krusn56 View Post
    I'm sorry...750 vac sec and electric choke...I was thinkin about my 850 dp on the shelf...my bad
    HAHA...Its all good. Theres so many different ones out there. I didnt know if it might have been an older one. I dont know if an 850 would be overkill for what I have...LOL

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    I went from a demon 750 vac sec to a holley 850 dp on my mild 502 and gained 200 rpms on a AA impeller. Very happy with the results.

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    tintingsandiego krusn56's Avatar
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    I have a mild 460 with the 750...great carb. I have a back up long block 460 that when I can afford to.... It will be a mild stroker and I might use the 850 then
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    I'm quoting myself because I posted this in another thread awhile back

    Quote Originally Posted by Cas View Post
    Here's what I went through when I had a fairly stock BBC on a previous boat. It came with a Performer 2/0 but I changed it out for a Torker that I had laying around.....no change.
    I changed the Torker out for a Team G single plane....gained 100 rpm.
    I was like you and heard a lot of good things about the RPM Air Gap so I picked up a used one for $100.00. Swapped out the Team G with the Air Gap and gained 200 rpms.
    I did try different sized carbs and the best all around for my set-up was a 750 vacuum secondary. There wasn't any difference on the top end between the 750 VS, a 750 DP and an 850 DP. The big difference was in fuel consumption so I just stuck with the one that got the best mileage.
    The engine had stock large oval port heads along with log exhaust, tached out at 4800 from the 4500 it had with the original set-up.

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    Quote Originally Posted by Cas View Post
    I'm quoting myself because I posted this in another thread awhile back
    This is simular to what Im facing. I have the original performer on it, but it has recangle port heads with log exhaust. The pump just got rebuilt, new shaft, bowl and impeller Dan told me he cut the impeller back slightly so it should turn 4800-4900 rpm. But its not, so I am trying to leverage what I should do.

    Thats a good post about the 750's. I guess for piece of mind, I should see what jets I have, and maybe pick up a few larger and smaller, and find someone who knows a little bit more about carbs to help me out.

    So you saying that other intake you got was better and turned better rpm's??

    What exactly is the "Air Gap"? Is that the distance from the bottom of the carb to the bottom of the intake??

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    Quote Originally Posted by headshothills View Post
    This is simular to what Im facing. I have the original performer on it, but it has recangle port heads with log exhaust. The pump just got rebuilt, new shaft, bowl and impeller Dan told me he cut the impeller back slightly so it should turn 4800-4900 rpm. But its not, so I am trying to leverage what I should do.

    Thats a good post about the 750's. I guess for piece of mind, I should see what jets I have, and maybe pick up a few larger and smaller, and find someone who knows a little bit more about carbs to help me out.

    So you saying that other intake you got was better and turned better rpm's??

    What exactly is the "Air Gap"? Is that the distance from the bottom of the carb to the bottom of the intake??
    yes, changing to the Air Gap increased the rpms by 200 over the Team G and 300 over the Performer with the combo I had.
    Here's a picture of the Air Gap where you can see there is literally and air gap underneath the runners and the plenum-

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    Quote Originally Posted by Cas View Post
    yes, changing to the Air Gap increased the rpms by 200 over the Team G and 300 over the Performer with the combo I had.
    Here's a picture of the Air Gap where you can see there is literally and air gap underneath the runners and the plenum-
    I have seen some instances where people put riser plates between the carb and intake, Im assuming this is the "Poor Man's" way of increasing the air gap. Sorry, dont mean to offend anyone by that statement if anyone has that setup...LOL

    What would be a good intake to look for if I wanted to change the intake from a standard Performer intake?

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    Quote Originally Posted by headshothills View Post
    I have seen some instances where people put riser plates between the carb and intake, Im assuming this is the "Poor Man's" way of increasing the air gap. Sorry, dont mean to offend anyone by that statement if anyone has that setup...LOL
    The theory behind some of the spacers is to increase the velocity of the air/fuel mixture thus cooling it down. A cooler A/F mixture is denser thus giving each cylinder more fuel thus making more hp. Other spacers swirl the A/F mixture which is supposed to atomize it better.
    I've tried a couple and haven't seen any measurable difference in performance.

    Quote Originally Posted by headshothills View Post
    What would be a good intake to look for if I wanted to change the intake from a standard Performer intake?
    The one mentioned above, the Edelbrock RPM Air Gap

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