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Old 12-06-2008, 09:03 PM
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600 650 or 750 with Victor Jr.??

Hey guys got a question for you.

I am building up a 31 Ford 5 window coupe http://www.hotrodders.com/forum/jour...57&action=view. My engine will be a small journal 327 with a Victor Jr. intake. I am planning to run a mechanical cam with about a .520 - .540 lift and approximately 10.5 compression. The heads will be a set of Dart 64cc chamber / 215 cc intake aluminum heads. The gear ratio will be 3.50 to 3.70 range and will use a 3000-3500 stall torque convertor. The rod will be a weekend cruiser but will also see some 1/4 mile stretches at the track.

My question is would you guys go with a 600 Holley, 650 spreadbore Holley, or a 750 VS Holley on the Victor Jr.? I've done the calculations with the idea of my top end RPM being around 7000-8000. Those are the only three carbs that I'm interested in and that is the intake I will use so those are your choices.

Any help will be much appreciated. Thanks.
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Old 12-06-2008, 11:22 PM
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If it were I, I would go back and rethink the combo, as it`s lop sided.
215cc runners are way too big for a small cubic inch 327.
Add that with a large cam and a open plane intake it`ll be really soggy and miserable to drive in the low rpm ranges. The engine won`t even start to make power until it reaches the 3500 to 4000 rpm range.
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Old 12-07-2008, 12:00 AM
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Ok, let's simplify the question. Which of the following three carbs would you run on a 327 with a Victor Jr. to run in the top end range of 7000-8000 rpm.

1. A 600 Holley
2. A 650 VS Holley Spreadbore
3. A 750 Holley VS.
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Old 12-07-2008, 12:24 AM
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Quote:
Originally Posted by 31fordcoupe
Ok, let's simplify the question. Which of the following three carbs would you run on a 327 with a Victor Jr. to run in the top end range of 7000-8000 rpm.

1. A 600 Holley
2. A 650 VS Holley Spreadbore
3. A 750 Holley VS.
None of the above. 750-850 Double Pumper. Oh, and the heads are too big. Your calculations are flawed.
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Old 12-07-2008, 12:56 AM
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Can anyone answer the question? Anyone?
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Old 12-07-2008, 01:03 AM
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Ok, out of the three YOU have chosen use the biggest, still not the right carb and you will never see 8,000 ...but hey, it's YOUR combo, why ask opinions?
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Old 12-07-2008, 01:22 AM
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I believe I said around 7000-8000. Thank YOU for the reply however.

Last edited by 31fordcoupe; 12-07-2008 at 01:35 AM.
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Old 12-07-2008, 02:08 AM
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What?? You didn't like my reply??
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Old 12-07-2008, 02:16 AM
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No, I loved it. You obviously have misunderstood me....
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Old 12-07-2008, 02:43 AM
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perhaps........
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Old 12-07-2008, 09:19 AM
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Out of the 3 choices I would rule out #2 - the spreadbore. That would require an adapter to get onto the Victor Jr (unless you have something other then the 2975?). Probably would start with the #3 choice.

Good luck with the build!
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Old 12-07-2008, 09:41 AM
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submit your question with details direct to: Holley.com tech service email......

it's their responsibility to have a "happy" customer!!!!

PS: your posts read to me like ya gotta' attitude
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Old 12-07-2008, 09:51 AM
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I suggest contacting AED out in Carolina.
They will recommend and build you the best thing for your situation.
They guarantee their stuff and will make you happy for only a couple bucks more.
It sure beats the heck out of guessing and fiddling around getting aggravated trying to make the guestimate stuff work right.
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Old 12-07-2008, 10:46 AM
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Koolaid and ScotFrenzel-

Thanks alot for your responses. I had planned contacting Holley tomorrow via phone and I will look into AED. I was leaning more towards the 750 as well. I really appreciate the input from both of you.

Last edited by 31fordcoupe; 12-07-2008 at 11:00 AM.
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Old 12-07-2008, 08:11 PM
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I`ll give you a small lesson on carbs and intakes.
When you use a open plane intake, it`s just that. Open. Meaning 1 cylinder is drawing off the entire mass of the carb so less total CFM is acceptable.
You could run a 450 carb and it would likely run it`s best due to the heads being way too big and the cam being too large, the small bores of the 450 carb would keep the velocity, which is very important, high, which would give the engine better throttle response and manners. When you want to make power, you cannot depend on one part of the engine to make it. The engine must work together as a team to accomplish this goal, this is how races are won and the most power is made. I didn`t tell you your combo was lop sided to be a smart a** or a know it all, I`m trying to tell you it`s not going to work very good before you even start. The best suggestion I can give you now is you will likely have to drill holes in the butterflies to get it to even idle.
Next best suggestion I can give is to keep a big bottle of tylenol in the glove box, cause it`s going to be a continuous headache to tune and drive in the low rpm ranges and your not going to be happy with it. You`ll need about 5:13 gears to keep the revs high enough to make it street driveable.
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