Hello all, I am getting ready to order a new carb for my car becasue of all the responces saying that my 750 Holley was too small. I am looking into getting a 870 street advenger Holley, vacuum secondaries, duel inlet. I just wanted to confirm with some pros (you) that this would be a good upgrade to purchace. I was able to get a price of about $315 + sh. I would really like to stick with Holley but is this a good cfm and so forth. I will list the specs of my car down below. 1972 Riviera 4800lb + estimated weight 455 .030 over bore machined iron heads 8.5 :1 compression stage 1 mechanical fuel pump 3/8 line with glass filter with stock fuel lines to the tank 90 octane gas HEI junk yard find from a 76 electra with stock curve, performance module, coil and 8mm MSD wires, NGK UR4 plugs gaped at 45 edelbrock performer intake Holley 750 double feed, vacuum, single pump, Jets 74 front 75 rear, stock discharge Nozzles, lightest secondary spring K&N 14in open air filter / with a tornado built th400 2300 stall Speed Pro 3000 Cam good idle, power range 1500-4500, .50lift 214/224 - .006lift 290/300, valve lift int. .469 exh .493, lobe c/l 112, lobe center 107 int, 117 exh 3.23 posi rear tires 275/60/R15 cooper cobras (bringing my rpms up at dead stop and punching it burns the tires up with no traction Shorty TA headers, 2 1/2 pipe, X pipe, dynomax ultraflow mufflers Thanks for your help. Davy
Davy, I have been looking at different carbs for my car also. Several brands and models are out there and I have heard many opinions on which I need. I have a 750 Street AVenger and have never been pleased with it. My Q Jet runs good, but I want better. So, after talking to half a dozen or more local drag racers, I have made my decision. They all love and use AED carbs. One guy picked up 5/10's on his modified muscle car by just replacing his old 750 with an 850 AED! I will show you an ebay link so you can get the visual of one, but I plan on buying a new one from the local speed shop. He gets $500 for the 850. Here's a used on on ebay: http://cgi.ebay.com/ebaymotors/ws/e...tem=7979161358&category=33550&sspagename=WDVW
I was also told to stay away from the Street Avenger line. I ended up finding an Edelbrock 1910 carb. It is a HI-PO 850 cfm q-jet carb with electric choke. They don't produce it anymore, but you can find them on ebay.
Thanks for the advice. Ok here is my situation, I love my 750 Holley, it is not the street advenger line but just the basic most comon 750. It works great and I am so much more pleased with it then the stock q-jet I had on there. It is just that I have had like 25 suggestions to go with more cfm like in the 850 range. So I wanted to stay with the holley that I was happy with and just go for more cfm and do a quick swap. However now from what you said I know I don't want the street advenger and I know I can't afford a $500 aed. What do you think the bottom line is here on the pros and cons of me changing my carb? How much actual gain am I going to see and feel by going up to a 850 carb regarless of brand? This car is a daily driver that I love to go fast in. I plan on going to the track maybe once a year if that. If I will see a .5 sec gain perhaps this is worth it but I am just clueless of what to do. Again I thank you all for your advice. Davy
I think you need to address your current fuel starvation problem first. See how the car runs and then make your mind up on the carb. I don't see .5 second by bolting on a carb. even though I have been told that. Maybe if the old carb. is total junk, but yours seems to be a decent carb. Get that puppy some fuel and work from that.
all your going to do is dump more fuel in with an 850 carb and run real rich. i ran a 750 holley on my 455 and it worked perfect for years trouble free. for a street car a 750 is plenty of carb.in fact im haveing a 455 built rite now with 10.1 compression and the engine builder said a 750 would be perfect and plenty of carb. dont know why everyone wants bigger carbs if all your doing is sucking more gas.you will not hardly get any more performance than a 750 unless you have more of a race motor. my thoughts Ray ________ Free magento themes
All good wisdom. My feeling right now is a relief that I am not going to swap out my carb so I can keep what I have. I really can't afford to put anything else on my credit card now anyway. I guess I will focus on my fuel delivery problem and then perhaps switch some jets around and see how that works. Is there a set procedure on tuning a carb, ie: jets, nozzles, springs and mixture? Can this be done in a shop or do you have to take multiple trips to the track?
go on ta performance and click on carb selection and it will explain acording to engine cid to cfm carb you would need.455 would need a 750 to 800 max unless your using it for racing purposes.thanks ray ________ N02 Vaporizer
Ok will check out the TA site for the cfm information. I have to tell you all this talk of my carb being ok for my application sure takes some worry off my shoulders.
i had a 750 holley on my 70 gs455, thought it ran real well untill i bolted on the 850 demon i just bought for my 455 regal that im building, i just did it for the hell of it and now i need to buy another one for my regal i was so pleased. but thats just my imput. dan
www.cliffsqjet.com This guy works pure magic with a q-jet and for your application of mostly street driving with one trip to the track a year, a q-jet just seems more logical IMHO.
i guess here is my thought on upgrading your carb,what do you do most with you car. racing or driving on the street.i would think if your driving 80 percent of the time on the street why would you want to dump all that fuel ina carb.if you really think going to a bigger carb would give you so much more performance, leave the 750 on and race your car at the track, then switch to your bigger carb and do same thing. i think you will be supprised that it didnt make that much difference.probably a couple miles per hour , if that even. thats is the only way you can tell if you would get any more performance.you might even get worse at track. thanks Ray ________ PRILOSEC LAWYERS
