460 w/ cj intake and q-jet?

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spectralen

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« on: January 02, 2018, 01:30:08 PM »
I have a DOOE-9425-D intake manifold. My engine now has the performer and edelbrock 750 carb set up. I'm thinking of going with the cast iron intake and a rebuilt Quadrajet. Just wondering if anyone has ever tried this on a jet boat. My boat is a 20 Spectra and Berk jc. Pretty much stock except I'll have a new DUI HEI distributor this coming season. I used to run a Q-jet on my 70 GTO years ago and I loved it. Being able to dial in the secondary air valves was a nice feature.
The carb in the pics is one I had laying around. Maybe It'll work?


LakesOnly

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« Reply #1 on: January 05, 2018, 01:40:35 PM »
If the engine in your boat currently has the Edelbrock carb and a Performer manifold (not Performer RPM), then that iron intake with Quadrajet carb would almost certainly show more horsepower on the dyno.  How much of that power increase you will realize in the jet boat might not be noticeable...or it might...depending on the overall engine combo.

But that iron intake weights 60 pounds, so if yours is a mild engine, then the power gain is so close that the lighter weight of the aluminum intake might make up for the power difference and the boat would have the same or more top speed with the current setup.

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spectralen

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« Reply #2 on: January 05, 2018, 01:52:10 PM »
I was recently told that the Q-jet might not be able to cruise my boat at the 3000 rpm mark without cracking into the secondaries. I am also thinking that if I can score a deal on a used Performer RPM I can then go back and fourth with carbs because they both bolt right on.
« Last Edit: January 05, 2018, 01:54:14 PM by spectralen »

spectralen

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« Reply #3 on: January 05, 2018, 01:56:54 PM »
 I'm curious what you think about the Q-jet on the RPM or have you had any history with them on Ford jet boats?

herrhauptman

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« Reply #4 on: January 09, 2018, 08:53:09 AM »
If I am not mistaken, at one time the Cobra Jet 429 came stock right from Ford with a Quadrajet carb.  It is a much better carburator than an Edelbrock or a Motorcraft four barrel.

 


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