Carb help

[sixnina]

Hey guys,
I just got my 383 in my camaro broke in but on a test drive down the street I find that the 750 dp I have on there bogs when trying to shift into second. So I guess what I want to know is how I should go about getting this carb dialed in. It's 10.5 :1 compression solid roller cam 576lift 282 duration. I bought the carb off a friend used. Is this carb too big or too small? What mods should I do to get it running perfect? I want to rebuild it but what jets accelerator pumps etc any help is greatly appreciated. Just need to know where to start. Will stock config work.

[Track Junky]

The easiest way to get the carb close for you would be to pick up the book by by HP Books and written by Mike Urich called Holley Carburetor hand book. It's small, not many pages and staight to the point.
In the mean time if you want shoot me a part no. and if the parts havent been changed out I could tell you what power valves, jets, squirters, etc. are in it.
If you want to get it dialed to a t and maybe give you some peace of mind you'll need a vacuum gauge for starters and an air/fuel ratio meter. The vacuum gauge will help you with power valve selection(although it probably has 6.5 in it and doesn't need to be changed). The air/fuel meter will help you dial in jet sizes.
What distributor/ignition set up are you running? What is your timing set at and what trans and rear gears are you using? Have you checked float levels?

[sixnina]

Thanks Gaetano this is exactly the info I was looking for I will check the part # tomorrow. I am running the Petronix stock hei setup.i am running a 4 speed super t 10. The float was set before start up.
Thanks Shane

Originally Posted by Track Junky

The easiest way to get the carb close for you would be to pick up the book by by HP Books and written by Mike Urich called Holley Carburetor hand book. It's small, not many pages and staight to the point.
In the mean time if you want shoot me a part no. and if the parts havent been changed out I could tell you what power valves, jets, squirters, etc. are in it.
If you want to get it dialed to a t and maybe give you some peace of mind you'll need a vacuum gauge for starters and an air/fuel ratio meter. The vacuum gauge will help you with power valve selection(although it probably has 6.5 in it and doesn't need to be changed). The air/fuel meter will help you dial in jet sizes.
What distributor/ignition set up are you running? What is your timing set at and what trans and rear gears are you using? Have you checked float levels?

[Vegas69]

Start with the basics and take it from there.

I'd take it off, pull it apart, inpect, clean it out, and then blue print it by writing down the jet sizes, power valve number, squirters, accel cams.

With that large cam I'd say it would need more like a 4.5 power valve, maybe less. It should be half of your vaccum reading at idle. Make sure you are utilizing the 4 corner idle by backing the throttle plates down to 0 and them opening them up evenly until you get close to your desired idle speed. You may need to have the primary open slightly more. Your idle mixture screws should all be the exact same amount out. Tune them to your highest idle or vaccum.

Then move to jets and accel cams/squirters.

[sixnina]

Originally Posted by Vegas69

Start with the basics and take it from there.

I'd take it off, pull it apart, inpect, clean it out, and then blue print it by writing down the jet sizes, power valve number, squirters, accel cams.

With that large cam I'd say it would need more like a 4.5 power valve, maybe less. It should be half of your vaccum reading at idle. Make sure you are utilizing the 4 corner idle by backing the throttle plates down to 0 and them opening them up evenly until you get close to your desired idle speed. You may need to have the primary open slightly more. Your idle mixture screws should all be the exact same amount out. Tune them to your highest idle or vaccum.

Then move to jets and accel cams/squirters.

Thanks Todd I will try these things and get back to you guys thanks again for the direction.
Shane

[intocarss]

http://tgsperformance.com/holley.htm

[FETorino]

282 advertised dur in a 383 isn't that big a cam, only 235ish @ .50 so unles it has a real narrow LS like 107 the 6.5 pv should be fine.

Most 4779 dps metering are pretty rich at idle and right off idle so keep that in mind.