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#55184 01/18/2006 6:20 AM | Joined: Aug 2005 Posts: 8 Junior Member | | Junior Member Joined: Aug 2005 Posts: 8 | Well my current carb is badly in need of a rebuild, but i'm opting for a new carburetor all together. Since I have the time and money...and i'm tired of quadrajets.
I had my eye on a Road Demon 625CFM, but was looking into a holley or road demon jr.
Any opinions there? What about tuneability and other aspects?
What i'm really wondering about is will the carburetor I end up choosing fit on my GM Performance SB High-rise vortec intake.
Was just hoping to get a non-bias opinion from you guys before I make a call to holley or barrygrant inc as to which application I should go with.
Some say the shade tree mechanic is a dinosaur.
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#55185 01/18/2006 1:56 PM | Joined: Nov 2002 Posts: 2,764 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,764 | Before you switch carbs would suggest the following:
(A) do a tune-up
(B) with a friend who is GOOD with a stop watch, go run about (3) quarter-miles and average the times.
(C) fill up at the same station, same pump, facing same direction at run about 3 tanks of gasoline through vehicle making a note of the mileage traveled.
You now have somewhat of a baseline for performance and economy to compare after you change carbs. You may be in for a major surprise.
Don't know much about the Demon other than what I have seen written (some good, some very bad).
Holleys are cheap and parts are everywhere. Expect to buy many of them to dial in the unit on your engine.
Cannot answer if the carb will fit your manifold; but you can. Four barrel carbs are basically spread-bore (ie Q-Jet) or square-bore (ie Carter AFB). So if your Q-Jet fits the manifold with no adapter, you need a spread-bore carb.
Do not use a spread-bore to square-bore adapter (or the other direction either).
As to brand, pick one that you (or your engine tuner) is either VERY familiar with, or plans to become very familiar with; as there are no perfect carbs out of the box (although the Carter TQ comes close).
Let us know which way you go, and the results of your comparison tests.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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