383 carbed and need some advice

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Apr 28, 2012 | 12:47 PM

c4vette85

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383 carbed and need some advice

So long story short I built a 383. Dropped it in with the tpi. Hated it. Put a eldebrock intake and holley 750 vac. secondary on it with a mallory 4309. My problem is it wont idle and has little to no power. The first thing that came to my mind was a vaccum leak but not 100% sure. Any ideas?

eagle rotating

comp xe274 .490 236 @ .50

10:1 compression

heads full ported and bigger valves (247 cfm)

stock pump with a mallory bypass regulator (4309)

Apr 28, 2012 | 01:04 PM

cv67

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From: altered state

St. Jude Donor '05

What distributor do you have in it?

Apr 28, 2012 | 06:16 PM

rklessdriver

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From: Dale City VA

What dizzy and what's the timing set at?

Also - If you've got a vac leak a can of brake/carb cleaner can find it in short order.
Will

Apr 28, 2012 | 07:26 PM

c4vette85

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I have a hei and I plan on looking for the vac. Leak tomorrow but would it result in the loss of power? And I have 35 degrees total

Apr 28, 2012 | 09:05 PM

cv67

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From: altered state

St. Jude Donor '05

is it the stock one or the non computer controlled type HEI is what I meant

Apr 28, 2012 | 09:14 PM

c4vette85

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It's a non computer controlled. Vac. advanced

Apr 28, 2012 | 10:11 PM

rklessdriver

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From: Dale City VA

Yes a MASSIVE vac leak would result is a loss in power (your leaning the motor out big time).... not to mention the Holley 3310 carb you have is jetted lean on the secondary (w/ a fixed jet plate) to begin with.... It wouldn't take too much to make it run like total crap.

Will

Apr 29, 2012 | 11:36 AM

c4vette85

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So I found a vac leak on my pcv hose and now with that fixed it idles alot better. Now Im pulling my carburator to rebuid it. The left nozzle is clogged and hardly spraying any fuel! It leans out very quickly. Hopefully she will be good to go soon!