Guest Anonymous Posted August 20, 2002 Share Posted August 20, 2002 Hello once again, All you guys with Z's sporting SBC's, what carb have you chosen? I was thinking of selecting a Holley 650 for a 350 chevy, but if there is a better choice for the application please let me know, thanks! Steven L. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted August 20, 2002 Share Posted August 20, 2002 From my observations: a lot of this area's cruise car crowd are sporting 600 and 750 Edelbrock rather than Holleys (10 to 1) A few years back it was Holleys and Holleys.If this means anything, for some reason a lot of people are switching to Edelbrock. Weber is making the Edelbrocks and for my application , the Edelbrock is simpler to understand than the Holley. Quote Link to comment Share on other sites More sharing options...
pparaska Posted August 20, 2002 Share Posted August 20, 2002 Yeah, alot of people are going with the Edelbrocks. But look at the application. It's probably a heavy muscle car. Look at the thread "mechanical or vacuum secondary" or something like that. It's a few weeks old. Anyway, I did the vac sec thing, then double pumper Holley. Quick answer: for a light car like a V8 Z, do the double pumper. That's my opinion anyway. Funny, I always thought the Holley was pretty easy to understand. Anyway, is kind of like a small block chevy V8 - everybody makes parts and mods for them. Quote Link to comment Share on other sites More sharing options...
Guest buschj Posted August 20, 2002 Share Posted August 20, 2002 Here is what I have learned over the years. Holley Vacuum secondaries Will increase gas mileage. It is hard to configure the proper secondary opening point(spring change)without a Dyno. Double-Pumper Hard to get it running well with an auto trans Instant power at all times You can watch the gauge move if you have a heavy foot Edelbrock - I only had one and never got it dialed in as well as a Holley. I don't have a valid complaint. Quote Link to comment Share on other sites More sharing options...
Mike C Posted August 21, 2002 Share Posted August 21, 2002 One reason the Edelbrock/Carter mech secondary carb is so popular it's a $100 LESS than a Holley. The Holley is easy to tune and rebuild (fortunately since they seem to need it every few years). On a mild street small block (210-220 deg cam duration at .050) I'd run a JET stage II Q-jet. The quadrabog starts easy, idles well, gets good gas mileage, and drop base air cleaners fit easily. If max performance is your game, the 4779 Holley 750 dp is the way to go. Same size throttle blades/venturis as the smaller dp carbs, so you have more tuning options up or dowm. If you have an unusual combo, get one with adjustable air bleeds, but for a common 355-383-406 SBC, it's the way to go IMO. The 331 in my Jimmy has had a worn out Q-jet, two different Holley 600 vac carbs, a 1970 Z/28 780 vac Holley, a 750 vac Holley and the current JET Q-jet. Max power nod goes to the 750 Holley, but drivability of a GOOD Q-jet is amazing. There is a reason they are expensive. They work well and are very high tech compared to a Holley 4 barrel. I have a 750 Carter on my boat and it works well. That is my only experience, but they are the best bang for the $ it seems. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 11, 2002 Share Posted September 11, 2002 SOLIDSNAKE; a 650 is a good size for a mild 350 say about 350HP, but more important is what cam, intake, heads and exhaust are you running?? The best running engine is the engine that is running matched cam, intake, heads and exhaust. Good Luck[although luck has nothing to do with it!!] Quote Link to comment Share on other sites More sharing options...
Guest kc6wfs Posted September 11, 2002 Share Posted September 11, 2002 Hi Steven, I'm running a Holley 600 DP. It's mostly a 1/4mi and weekend killer. But I have always used Holley carbs. I'm used to tuning them and know what they are llike. Thanks. Dave Quote Link to comment Share on other sites More sharing options...
jeromio Posted September 12, 2002 Share Posted September 12, 2002 I choose NO CARB!! EFI EFI EFI! This is my chant. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 12, 2002 Share Posted September 12, 2002 kc6wfs, where did you get your front spoiler? That is the exact kind im looking for. Is there a specific model or year it came on? Quote Link to comment Share on other sites More sharing options...
jeffp Posted September 18, 2002 Share Posted September 18, 2002 I have run holly carbs and carter(edelbrock) carbs. You want the best carb for your application, get an older carter 625 competition series carb. You can find them on ebay. They are easy to tune and rebuild, there is a a strip kit you can get for them with various sizes of jets and needle jets. The mechanical linkage can be adjusted to open perfect for your application. The carb is good for the street and the strip, they are very good on an incline. I ran a holly 600 with vacuum secondary and it worked well, but there are things about the holly carb that is a total pain in the butt. back fires for what ever reason has a good chance of blowing the power valve (I know they have a fix for that but cant remember what it was) jetting the carb is a total pain in the butt, you have to take the bowls off and all the fuel gets everywhere, so you really need to take it off the car to do the work. The carter can be jetted on the car and that is a real time saver. The holly has a tendancy to flood out on a good incline, the carter does not have that problem at all. I found this out when I installed a holly on my friends jeep and tried to four wheel it, total flood, he took a carter off the engine and it NEVER had any problems with any incline. I ran my 625 on a 302 bored 30 over and it worked excellent. I was totally sold on the carb when I started using it, it is easy to tune, and it is simple, parts are cheap. I think dollar for dollar it is the best buy. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 19, 2002 Share Posted September 19, 2002 New holley's have the power valve protection on them already and have for a while I'm told. Its just a check valve where if the pressure reverses it just opens up and lets it vent rather than taking out your power valve. Older holleys can be retrofitted for a few bucks the kits are available with a drillbit and check valve. I bought a vacuum secondary holley because I believe what everyone said about using one on the street. Well the fact is, if the cars light (the Z is) a vacuum secondary is not needed. If I were to buy another carb, I'd probably buy the carter 750 just because as mentioned its much cheaper (like 207.00 at jegs and summit mech choke, why not the car has the lever already). A 600 would work just fine, but I'd like to be a little on the big side for future plans. That said, I'd have to agree that EFI is what I'd rather do next dollars permitting, its just way better all the way around, but way expensive even doing it piecemeal like I plan to do. Just an opinion, holly vs edelbrock/carter the debate will never end, but either will get it done, some claim more top end on a holley but the shoot outs never seem to ever try very hard to get the best out of either. Regards, Lone Quote Link to comment Share on other sites More sharing options...
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