SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 87hardin on May 04, 2015, 07:00:38 PM
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Looking to rebuild my carb but the other side of me says to buy a new one. What i have now i think is a 780 cfm holley
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Sorry guys kinda new to this any input
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What you have there is a factory Ford Holley carb from 1971. I couldn't make out the Holley List number to be able to tell you what size it is.
If the carb is not damaged or worn excessively you can rebuild them many times without issues.
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If it's a list 6361 is a 650 cfm. Personally I would pick up a new one.
GT
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Ok thank you for that would vacuum or mechanical secondary
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Also Holley or quick fuel...
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Tell me, what do you have for a set up? Inches? Exhaust? Type of hull etc...
GT
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454 edelbrock performer 2.0 hardin logs 20.5 hardin hull 12jg Berkeley jet
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454 edelbrock performer 2.0 hardin logs 20.5 hardin hull 12jg Berkeley jet
No less than a 750 cfm.
Vacuum secondary with modified vacuum pot if you cruise it a lot.
If you are a weekend warrior and hammer down for weeks at a time, I would go 850 double pumper with a fuel pump to back it up.
GT
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Yeah not a weekend warrior but i would like to hit it every now and then what about edelbrock carbs
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And what about electric choke
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What's a modified vacuum pot?
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Mr GT i could understand if you wanted to give more information tomorrow. I know it's getting late. Thank you for helping me out , hope someday i could help out .
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Yeah not a weekend warrior but i would like to hit it every now and then what about edelbrock carbs
Junk (Edlebrock) for a boat
And what about electric choke
Don't need a choke.
What's a modified vacuum pot?
You need to order a secondary spring kit and use the lightest yellow spring.
GT
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I have a 950 dp Holley on my 454 with a mild cam and performer as well. Best carb I have put on there hands down. I personally don't like the edelbrocks I would go holley
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Mr GT i could understand if you wanted to give more information tomorrow. I know it's getting late. Thank you for helping me out , hope someday i could help out .
No problem brother. Just doing some reports and zoning while checking the boards.
GT
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Ok looks like i will be shopping for 750 or 800 cfm I'll keep you informed.
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Yeah i don't know what cam would be in this engine and don't want to find out anytime soon just bought the boat and would like to see it run for a few years before I go building a engine.
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You need to order a secondary spring kit and use the lightest yellow spring.
GT
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Can you explain this please? Thank you. I am also running a 750 vac sec and am curious about how this will improve my carb. Thank you.
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GT if one was to purchase a new carburetor how would I know what jets to run, would it come jetted close to what i would need ?
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You need to order a secondary spring kit and use the lightest yellow spring.
GT
Can you explain this please? Thank you. I am also running a 750 vac sec and am curious about how this will improve my carb. Thank you.
Holley offers a selection of secondary diaphragm springs to tailor when the secondaries will open. You will normally have to go to the lightest spring to get full operation of the secondaries in a jet boat application.
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GT if one was to purchase a new carburetor how would I know what jets to run, would it come jetted close to what i would need ?
Never.
It may be close. But just plan on tweaking it.
GT
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Ok thats what I was thinking thanks again.
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Can you explain this please? Thank you. I am also running a 750 vac sec and am curious about how this will improve my carb. Thank you.
Crewchief22 pretty much nailed the snot out of it.
To elaborate. A jet pump pulls the engine down so hard that the vacuum levels within the manifold are almost non existent.
This leaves the secondaries partially closed with the standard secondary spring and leaving quite a lot (imho) of performance on the table.
By using a lighter secondary spring, it allows not only the secondaries to come in earlier, but open further.
Hope this helps.
GT
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Yes. Thank you. Gonna change the spring. What jets do you recommend?
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http://www.bgsoflex.com/holley.html
Check this out
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