Question about 1991 Chevrolet S-10 Blazer

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I have a 70 hemi 528 cuda i have a 1000 cfm holley, i just put the #12-802-1 now what should i set the pressure regulator at?? the psi

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Posted on Jan 02, 2017

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SOURCE: looking for baseline jetting for holley 850 cfm dp

I'd begin with "square jetting" (same at all four corners) at about 85. Then take plug readings to see which direction you need to go from there. "off the line" performance can be changed by moving the plastic cam on the primary linkage. Once you have a good baseline for your engine (each engine will need different jets, depending upon use, engine size, gearing and what you have inside etc.) then you can make fine adjustments up or down from there. 850 is about the high limit to carb size on a stock 350 engine.. When making changes to engine, do only one thing at a time, otherwise you may make a good change and cover up the results by making a bad change somewhere else.
Good luck!!

Posted on Sep 21, 2009

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SOURCE: how to hook up vacuum

When attaching vacuum lines, you need to remember only one thing. Mark each hose when you remove it from the original carb (quadrajet?) Hoses that attach to the baseplate are at full vacuum and should be returned to a similar location or to the manifold, using a "tree". Hoses that are connected to the body of the original carb only see vacuum when the throttle is opened. Those can be attached to the fitting on the right side of the front metering block. Most Holley carbs have no provision for the valve located at the front of early Q jets (bowl purge) nor do they have any electrical connections except for the choke mechanism.
The most important vaccuum line is the one for your power brakes. Make sure that one is firmly connected either to the rear of the carb baseplate or the manifold. All other lines are nowhere as critical as that one is..

Posted on May 18, 2011

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Got 308 v8 in nissan patrol running 600 cfm holley running to rich is carby to big

get it jetted right and it will probably pass
308 would work best on a 450 -550 holley
running rich could be
float levels too high
excessive fuel pressure --use a regulator in the fuel line
damaged power valve diaphragm-- subject to burning holes in the diaphragm on back fires
the idle mixture screws incorrectly adjusted
there are speed shops with chassis dynos that will be able to tune the carby correctly so talk with them about the carby size and the problem

Dec 31, 2016 | Nissan Cars & Trucks

1 Answer

Smell of gas in the exhaust

run fault codes and look for faulty injectors. have a pressure test done on the fuel manifold to check pressures/regulator/filters.. If you have a carby set up check automatic choke operation and float level settings. If a holley carby check for a failed power valve diaphragm.

Dec 07, 2013 | Mitsubishi Cars & Trucks

1 Answer

Intermittent fuel pressure drop, to 5 psi, on a stratus 2.4l 1996

Sounds like a bad fuel pump to me.Or dirty fuel lines/injectors/regulator.

Mar 22, 2013 | 1996 Dodge Stratus

1 Answer

I have a 1984-85 holley 4 barrel and it has

Electric fuel pump most likely has too much pressure for the carb. AFAIK, the Holley 4150/60 & 4165/75 should each demand the usual 4.7-5.3 PSI (4.7 @ idle, 5.3 @ max RPMs), so even the Holley red pump would need some restriction from a regulator. If you want this to be adjusted to its best efficiency, you need to have a fuel pressure gauge installed temporarily, if not on the regulator like I have on my Scout II. FWIW, the regulator I have installed is the Mallory 4307M from,,, etc.

A bad Needle & Seat will do this also, or debris stuck between the Needle and the Seat. This is where light tapping on the bowl helps, but it's best to run the fuel out of the bowl a few times and then the volume flow, or quick filling of the bowl, should loosen up the debris.

You also could have set he fuel float too high. What model carb, the ones I mentioned above (AKA Holley Modular Carbs)? If so, then Holley's site has a tech center & instructions on setting the float(s).

Set the floats carefully and slowly/gradually. Make sure the lock screw is always loose enough before turning the adjustment nut. If you strip out the bowl's threads on an older carb, you'll beat hell finding a replacement. 1/12 turn = 1/32" of fuel height IIRC. You set the fuel level, with pump running (wrap a rag around the carb so gas doesn't leak onto the manifold!!!) so the fuel is just starting to dip out of the "peep-hole" in the side of the float. Removal of the peep/seep-hole screw/plug is necessary first. Clockwise rotation of the nut lowers fuel level IIRC and counter raises fuel level. Again, please check their website. Most people get discouraged when dealing with the Holley Modular Carbs, but they are the simplest and the best carbs on the market. Even if 30+ years old.

Apr 15, 2010 | 2000 Ford Expedition

1 Answer

Just wondering if you can tell me how many cfm a 48ida flows

Mate.It pretty much flows the number.IE 500 holley is 500cfm.48,s are 480.Thats a big bit of gear for an rx7.Just make sure the metering pump for the oil injection into the carbs are upgraded,otherwise the motor will cook the apex seals every week.It would not hurt to up the oil pressure by 2 lb if you are going to rev the motor over 7400rpm.Are you putting side draught or down draught.Hope you go well!

Jan 21, 2010 | 1985 Mazda RX-7

2 Answers

Speedway Car that misfires at 5500 rpm

Back in my racing days,I used Jacobs Electronic high voltage spark electronic box.

Believe it of not the engineer is calling for COPPER plugs!

Everyone know Platinum will last but copper is still the best conductor.

Try a cheap set of Champion or Autolite and see what happen.

Also check for

Intake gasket leak.

Fuel pressure

CFM requirement for the Holley carb.
Try a an without the air filter and see is it still choke at 5,500 rpm.

Good luck

Jul 18, 2009 | Mitsubishi Sigma Cars & Trucks

2 Answers

Strong order of gas fumes and black residue on spark plugs

The jets in the carb are too big for a 302 with a stock cam. Take it to a carb shop and have them replace the jets with stock jets. (Or DIY and hope). Whne you converted from FI to carb did you replace fuel pump to get correct 7 1/2 psi pressure at carb inlet? FI pumps put out 50+ psi and a regulator maintians pressure at the injectors on the order of 35 psi.. Of course, that much pressure would force inlet needle valve out of it's seat and would probably flood carb totally, but, check the fuel pressure at the carb just to be sure. Good luck. 302's rule!!!!
PS - Check cam specs - FI engine has different cam - intake duration is longer if I remember correctly. Been a while since I got inside an engine...

Apr 27, 2009 | 1965 Ford Mustang

1 Answer

Oil psi

yes that is fine for a stock engine u should have 10 psi for every 1000 rpm and oil grades and weather play a big part on oil pressure

Dec 27, 2008 | 1998 GMC Sierra

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