holley or quadrojet
 

I have twin 330 mercruisers, I need to rebuild carb's, I was wandering if going to holleys would be a better choice? if so would a 600c.f.m be big enough?

Re: holley or quadrojet
 

The Quads on your motors are a perfect carb for the application. swapping to 600 or so holleys would gain you nothing and cost you plenty. Those q jets can flow big power if the rest of the engine can make use of it. You could use them to make 400hp plus if cammed correctly. Save the bucks and rebuild them, they are simple to do if you can follow the instructions that come with rebuild kits. replace the floats at the same time and whatever you do, DO NOT LOSE the little spring under the primary power piston( the thing with the needles hanging on it. They are a nightmare to get replacements for.

Re: holley or quadrojet
 

I would stick with what you have!
Unless you want to start fooling around with new fuel lines, and possibly having to play around with jetting. Holleys are great but do require a considerable amount of tweaking.
Rebuild your existing carb and forget about it!!!!!
Good Luck
Brian

Re: holley or quadrojet
 

Thanks for the advice, that's all I needed, I will repair the quad's. Thank's for the input!

Re: holley or quadrojet
 

I have quadrajet, which my boat mechanic frequently called quadrajunk. Maybe he was screwed up, but it seemed that it was never set right, either it'd bog down really bad coming out of the hole from too much fuel, or not open up enough to pop out at a reasonable rate. What's up with that??

Re: holley or quadrojet
 

A major mistake made rebuilding these carbs is the lead plugs in the main body leak and create vacuum leaks. Get some 2 part epoxy and neatly apply over all the lead plugs.

Re: holley or quadrojet
 

I've used both. I like the better mid range feel and the improved tuneability of the Holley. More power ? Maybe not at WOT, but maybe at cruising RPM. Just seems a better carb for a boat. Smoother feel all around.

Re: holley or quadrojet
 

I am new here .. but how would you know that when you don't even know how to change your engine oil?

Duh !!

Re: holley or quadrojet
 

Goes to show you how much you know. If the dip stick was installed incorrectly the level would be low... Post#1? Good start. We all know who you are because you were spotted on the freeway towing your hobie cat with the '82 chevette.

Re: holley or quadrojet
 

Q-jets are prone to leaks at the bowl plugs under the base. They should be epoxied when you have them off. They are also almost as infinitely tunable as a Holley if you know how. For the bogging problem the secondary air flaps need to be tightened up just enough till the bog goes away, simple to do but lots of people don't know how. Some of the crispiest throttle response I have ever seen has been with a Q-jet. Those that know them love them, everyone else rebuilds their Holleys every year or so :rolleyes:

Re: holley or quadrojet
 

I always scoffed at Quadrajets (Big word of the day). I'm a Mopar guy and always had good luck with my Carters, and never had the need to play with Quadrajets. Now that I'm running Chevy engines (In boats), and have done some research, and learned how to work with the Quadrajets, I can see just how good of a carb it really is. Take some time with the rebuild, and buy some of the excellent books out there on tuning Quads, and you'll be happy with it. :)

Re: holley or quadrojet
 

Hello Knob.

Re: holley or quadrojet
 

Dennis Moore's book claims better cruise economy and better all around for boats unless you have a special app (mega cam,blower or whatever) I switched to Holleys for a procharger install then decided against the boost but left the carbs. They seem to do well too but I have 450HP's and thought I could tune them better.
"Midnight Express"???? Seems appropriate for a midnight cowboy.

Re: holley or quadrojet
 

That's what I was thinking, too. Attitude was give away.

Re: holley or quadrojet
 

Holley's all the way.

Roby

Re: holley or quadrojet
 

Looks like Mr. Hobie cat is back!!!!

Re: holley or quadrojet
 

LOL, Sounds like "tempest/bluewater1" has 2 identities. Cross dresser perhaps?

Re: holley or quadrojet
 

Chill on this dude, are we not all here to learn. If we knew everything why would be posting and reading on here?
Chill on Blue'- after all it wasn't a Hobie it was a Windsurfer and I have to admit he was doing pretty good!

Re: holley or quadrojet
 

We all learn by our mistakes and I know I've made some good ones. This is why we are here to help each other out. Met with nothing but good people here but guess there's always a bad apple in a bunch. Learned alot as well !