I know I'll probably be told a dozen times before this day is out, that it will not work. Just hear me out. I have a 600 vacuum secondary Holley that I really don't have much in, except a rebuild, jets, and misc. stuff. I finally got an engine for my SA track car a couple of months ago. I decided to use my old RB intake on it, but I didn't have a carb for it at the time. I get this Holley practicly handed to me. I figure I'll try to use it. So far, I have 50 jets in the primarys. 53 secondary metering plate. 18 accelerator pump squirter. The small white acc. cam set in the number one hole. I have the car running great sitting still. When I take her down the street, it bogs like a ****** for about 2 seconds at 1/3 throttle, then picks up pretty good till about 5 grand, then starts loading up. I've shot some pretty good backfires in the neighborhood, trying to get this any better. The ignition is a second gen direct fire on the leading, stock coil on the trailing. Fuel pump set at 7 psi. I've never had much experiance with Holley carbs, but I know what hell robs_seven and myself went through trying to get his RB "prepped" Holley 465 tuned for his street port SA. If the general concenses is the 600 just isn't going to work with a stock port, I'll try to see if I can come up with a smaller Holley. Thanks guys.

 

If you plan on tracking this car, you couldn't pick a worse carb to try and use. Not only is it too big, has vac secondays, it also has side hung floats. Have fun dieing in the corners, lol.

If you're simply learning for some Holley tuning experience, that 600 will be a good challenge for you.

 

Yeah im about to attempt to put on a 600 edelbrock, there is a thread somewhere here on how to change the jets over to the proper size. "jetting it down" Now trochoid how about you help me remember.

 

Sorry, don't do Holleys, that's why I'm selling mine off. 2 barrel and dual 2 barrel carbs are much more fun.

 

neither do i, i do edelbrocks, but becides the points im just trying to find that stupid thread about how to jet it down. I think its a link to another site..damn.

 

You can eliminate alot of the bog with a spring kit for the secondaries. Go lighter until the bog is gone. You can also play with pump cams and squirters if the spring doesn't cure it. It might also just be too big, like your friend said.

 

Trochoid is correct about the cornering issues. I love Holleys easy to work on because I'm familiar with them. If you want to use the 600 you must modded. You will need to install a power valve block and mod the secondaries to open mechanically (you have to improvise). A Zip tie or a little screw to help the secondaries to open. For stock a motor 68p and 69s will work just fine! It all depends on your timing. If you tune it well you won't notice the bog from the primaries to the secondaries.

 

I have a nikki carb and i want to put a holley with a stock 12A. What are your recommendations on the intake, which holley should i start with, how can i put it together..I need help!! Thanks

 

Welcome to the forum and the Darkside.

Racing Beat sells a rotary prepped Holley 465 for the the stockport 12As, along with the needed intake mani. If you're used to tuning Holleys, that may work for, not my brand choice for a rotary carb though.
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I'm a 4bbl fan, but haven't had much work with the holleys, mainly just Sterlings.

I just wanted to add a "plus one" to the four barrel guys, to offset trochoid's affinity for 2bbl carbs

Jon

 

Well, as far as the primarys and the secondarys jetting, the 600 comes with 64 and 65. I have a power valve block in it already. I thought the bog could be a result of the stock secondary spring being too heavy. The stock jetting on the 600 is way too rich for a stockport. Been through that process of elimination. Any more ideas? As far as the Holley being a side hung, and autoxing, that would be better than a center hung, right? Because the carb sits sidways, the center hung bowls would be more affected by side to side tilt, right?

 

I'm asuming you bought the jetting kit for the secondary. My stock12a use to lean with those jets. Give trochoid's idea a try if you dont mind spend the money to buy a new or used webber. I will buy your Holley from you and make it work.

 

Center pivot floats would be better for cornering. You're going to have to play around with the jettings/ squirters with that 600 on a stock 12A. That 18 squirter sounds too small. I use a 550 throttle body with a 600 dp throttle plate, with center pivot float bowls, 25 race squirter, and a dual feed setup on my 13B SP and works really good. I'm always playing wround with the jetting too.

 

I meant to say heavier till the bog is gone. Too light a spring will make it dump open too soon, causing a huge lean spot in the curve. Heavier= more gradual opening, so the fuel delivery system can catch up. Been awhile since I messed with a vacuum secondary...

Personally I like double pumpers. Vacuum secondary carbs are for heavy cars with automatics and highway gears, which RX-7's typically aren't. If I didn't already have injection i'd go the mikuni route.

 

If your not going to make constructive comments, I would prefer you not to waste my thread. Anywho..........I guess it would have been better to ask the all important question......HAS ANYONE HAD SUCCESS WITH USING A 600 HOLLEY ON A STOCKPORT 12A? IF SO, WOULD YOU PLEASE GIVE ME SOME ADVICE ON SETTINGS. I hope this clears up any confusion on what I am asking for. Thanks.

 

YES I LIKE HOLLEY CARB. I was being funny bad83 I apoligize. All joke aside the 600 Holley will/can work on a stock motor. Timing and the right jets it will work. I like to run on rich side because I like top end. My timing is always on the retarded side personal choice. I learn most of my stuff from Puerto Rico. If they do it we can do it. I'm not asking you to believed me. I know the 600 Holley can work on a stock 12a.

 

yes its been proven a few times, as with the 600 edelbrock like mine.

 

the back fire is from it being too lean. 53's are too lean

 

the 2 sec hesitation is probably from the accelerator pump cam is set wrong and is squirting gas late. Which is another lean issue.

 

600 on a stock port 12a will scream. I had mine on a 12a do 9.5 secs in an 1/8th mile with crap street tires. easily smoke any stock v8.

another trick you need to do is get rid of the powere valve and vac secondaries. you have to use the screw trick to engage the secondaries.

 

Holley's need atleast 6psi fuel pressure

 

Man.........I'm retarted. Well, my timing was. I found out the only visable timing mark on the thing has to be for the trailing. I desided to put the stock setting back on the carb the other day. It ran a little better. I found the timing issue out yesterday. Needless to say, there is a 45 feet black mark in front of my house now. I still think it's running a little rich, but way better improvement. The bog is gone, and I can put it to the floor now! WooHoo!