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Discussion Starter · #1 ·
Holley 750 D.P. is the carb. 68's in the front 76's in the back.


385 c.i.
9.8:1 Compression

K-1 3.75 forged Crank

K-1 5.85 forged Rods

SRP flat top Forged Pistons

AFR 195 Eliminator series. 75 CC domes

Comp Cams XR286R Solid Roller
576/582 248/254 @ 050

Lashed .016 intake - .018 exhaust.

Edelbrock Airgap Intake

Wilson 1" tapered spacer.

Hedman 1 5/8" headers w/ 3" collector.

37* timing ALL in @ 3000 RPM

Watertemp @ avg. 170* (That stewart waterpump sure can keep up!)

The motor made 511.4 Hp @ 5500 RPM
500.00 ft lbs. Torque @ 4900 RPM


Start with the idle screws obviously. Not sure where to start though. 1 turn out? 2 turns out?
 

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Most 750s im about 82-86 squared,,, With a power valve usually 74-78/82-86 but again depends on application

Just mentioned it because jetting looks off IMO
 

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Im running 75/75 and 82/82 in my 383. plugs are clean
 

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What are you trying to compensate for? Better power? Cleaner cruise and idle? Or both?

I agree, start with stock jetting. Should make better power.

To clean up cruise and idle, start by setting the idle mixture screws with a vacuum gauge. Seat both of them, then bring them both out 1 turn each. Hook vac gauge up and continue to adjust them out 1/8 turn at a time(alternating between the two) until you acheive the highest reading on the vacuum gauge.

if you're complaints are still too rich and stinky at idle, and rich at cruise...it'll take a little a little more in depth tuning.
 

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Discussion Starter · #6 ·
Changed the jets, seems to run a little better. Still very rich at idle. I mean, burn you out of the garage with your eyes watering rich. I set all the screws to 1 1/2 turns out. Would 1 turn be leaner than 1 1/2 turns or visa versa? Where would be the best place to hook the vacuum gauge to?

Thanks, Joe Phillips
 

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Changed the jets, seems to run a little better. Still very rich at idle. I mean, burn you out of the garage with your eyes watering rich. I set all the screws to 1 1/2 turns out. Would 1 turn be leaner than 1 1/2 turns or visa versa? Where would be the best place to hook the vacuum gauge to?

Thanks, Joe Phillips
the further the screws are in the leaner, it could also be the camshaft overlap, pushing out unburnt gas at idle
 
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