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Thanks!

Do you block the old holes ??

What does the holley book cover look like, i want one , There are so many books out there!

I have a Holley 670 on my 390 FE. It’s dialed in pretty close. On transfer slot steady driving my afr is about 12.8 to 13.8. When I nail it,it goes lean briefly. All the way to 20 on the afr. My idle restrictor is a .035 and my air bleed is a .075. If it’s rich before I wack it why is it going very very lean until the power valve and secondaries catch up? 670 truck avenger. NOS. Brown spring on vacuum secondary.

The 67 Corvette Holley (2 idle screws) uses IFR’s measuring .028”, so I stay in the .025” to .029” range more importantly w/4 corner. Favoring .025” IFR & smaller IAB’S. There is a range (IFR/IAB) of air to fuel ratio of around 19:1 area wise that seems to work well. Too big an IAB kills fuel velocity. I find modern Quick Fuel/Holley’s everything is too big. So one needs to recalibrate EVERY ORIFACE (IFR, IAF, PVR, JETS, everything) right out of the box to avoid black spark plugs, overly rich, and stinky exhaust. The transfer slots need to be restricted from .106” down to .081”/.078” because the T slots are too big. I’m talking street use not drag racing. I like your series😊

I have a 289 sbf w/ a big cam and it idles between 1200-1400 rpm. Anything lower than that and engine stalls. Any idea how I can bring down the idle between 1000-1200 rpm? Thanks in advance 🙂

Your videos are VERY informative. Thanks.

What would happen if you put another primary metering block on the back?

Great video quickfuel ss models come with metering blocks that have screw in everything also air bleeds. They are expensive !

Could i theoretically put a 1000 throttle plate on a 600 or something similar for maximizing velocitie

Thanks!

So when you go from 750 base to 850 base are you picking up flow and velocity?The venturi size is staying same just increasing the base plate bore size.

What would be a good emulsion size bleed for a blow though billet metering block carb to start with? As always you one of the easiest to understand videos on the tube out there.

my 4160 Cab on my 390 engine, i had to spray gas into the Carb for the car to start it wasn't spraying when you press gas, , i rebuilded the carb now it's spraying but now i have to press the gas to start the car once i stop pressing gas car turns off, any suggestions please?

Great explanation ON boosters👍

Outstanding 😊

Hi Randy, I have a 750 main body & metering blocks that accept screw in type air bleeds. What size do you think I should start with?(base line) I’m starting from scratch. 70 chevelle 454 comp cam. 4corner ldle & the metering blocks have 4 circuits. Thanks!

I know this thread is Old, however I figured you would receive my question... I have a metering block with a place for a power valve but with no pvcr. I guess my stupid question is: is that just a mistake?

Do you guys rebuild carburetors for other people or just yourself? I’d love to send you guys a carb and have it redone by you guys!!!

Great video ! Thank you 😁

Love this information. Thank you for sharing Randy. I just put together a 500" 440. Has a QFT 950. And my afr is in the 10.0:1 range. I'm going to follow this advice and tune it properly. She's a mean mopar.

Had two new fuel pumps mechanical, and had 12psi and 14psi flooded like hell,put on fuel regulator 5psi called it a day

Can you install some boosters in mine?

Great advice!

will stall out when hot at low RPM, then very hard to get going again, the rotational mass thing makes sence.. adjusted values the other day, will try to look at them again, no clue have tried every thing imaginable to resolve the issue.

Awesome explanation! Makes 100% sense

Quick question for you. I have an original Holley 3310-2 that I restored. It has with a worn out original baseplate. I purchased a new 112-9 replacement baseplate made specifically for the first 4 generations on 3310. The transfer slots on the new unit are all the same length and short like the secondary transition slots are on most Holleys. The old base plate and my last two Holley carbs had longer primary transition slots. Could this 112-9 be a defect? All four T-slots measure .01945. Any ideas?

thanks again

Thus is the only explanation that has ever made sense. I now know that I adjusted idle too high and the teanfer slot is dumping fuel. May need to drill the holes. Hope u have a video on that

How about we put that solonoid on a movable bracket linkage and have a second one that can push that one? Now we have high idle for a/c and anti-diesel.

Now that’s a screwdriver lol

Hi. Thank you for a great understanding of the idle circuit. I just bought a summit 750cfm carb for my pontiac 421ci. The engine is very tame/lame. I can not get rid of my off idle stumble no matter what I do to the accelerator pump settings or idle mixture screws. If I'm barely cruising or at a stop and barely touch the peddle, it stumbles. I'm about to send it back but thought I'd ask your opinion.

Not sure if this was asked before, but is there a visual way to look at a metering block to determine if it's a 3 or 4 circuit block?

Excellent details. Thanks a ton.

On a holley with front idle screws only 650 dp for e ample if you change front air bleeds should rear air bleeds be charged to match

Great drill and tap video, but why did you do all that work

Probably the best and most understandable explanations I've ever heard. Great job! Thank you!

Your videos have been great. Clear and educational. I have a pair of 4150s on a sbc with a holly 250 blower. Iam going through them and noticed the secondary air bleeds in the center (high speed?) appear to be closed on both carburators. These 650dps are 2 corner idle circuts carbs, does that something to do with it. Iam scratching my head here. Is this normal......

hey Randy, love your videos. Is there a way I could contact you about my Holley issue that I’ve been chasing for a year now. I have rebuilt it 3 times and still same problem! Thank you

great videos, my issue is with a 4160 600 cfm Holley, it idles fine but as soon as it goes off idle it seems to flood and skip or tremble and stumbles until you accelerate much more or return to curb idle. HELP!!! This is on a 1986 F150 with 351 HO engine Thanks in Advance

Great video and provides a lot of information that I think has been missing in different internet discussions. Having a problem with a 1000 cfm dp down leg boosters, and hoping to maybe get pointed the right way. 500 cid bbc. Demon body with Holley 5 hole blocks (6 if you count kill bleed). This is in a boat and it’s under load all the time. Idle and transition are okay but once on the mains it continues to lean out. Jets are 91/98 with 070 pvcr primary. Emulsion is: kill bleed 027 then 028/0/028/0/0. Main air bleed is 28. Floats are right. Frustrated with how much jet I’ve needed. Dangerously lean at peak torque (4700 rpm - 14.2). Was going to drop the main air bleed to 025 and work way up. Close up the emulsion too?

Are ya supposed to run the float spring with the nitro. Floats??

on a progressive 2bbl I have 2 different booster sizes, does the smaller one go on the primary side? ones labeled a 509 and the other is a 555.

Randy, I just upgraded my 3310-2 from a 134-21 metering plate to a secondary metering block conversion Holley kit. The factory metering plate had .039-.040 IFR’s. This new metering block has .030 IFR’s. Does that mean I have to drill them to .039-.040? Any advice would help. This carb has no secondary idle. Only the tiny drip holes under the secondary transition. Thank you and great video!

Hi Randy I have watched these 2 vids multiple times before I started drilling the holes in the butterflys. Instant success ! I had been at my wits end trying to lean off the idle, these vids were the best explanation I could find. So I have solved one problem but created another now, I have a lean stumble off idle, not accelerator pump fault, that works fine this is a lean spot as you are at minimal throttle for instance like when you just want to creep the car along it will stall. If you blip the pedal it will move fine. Is this a lean transfer slot problem do you think. It didnt do this when is was running a rich idle. The carb is a 670 Brawler vac secondary. 4 corner idle. 6 months old. Kind regd's Phil. NZ

Very interesting I have always liked to rebuild and mess with carbs Thank You. !

Hi Randy, I almost went and purchased a replacement metering plate with a bigger main hole but it looks like I can modify my current one in my 4160 2 corner 600cfm Holley carb. I got the carb mostly tuned right everywhere else and with regards to this video, I was wondering if there's a way to modify the metering plate to get rid of a ~1 second lean spot (15-16AFR) entering WOT (less than 1" vacuum). I think that's when my secondary throttle blades start opening. After that 1 second lean spot my AFR recovers to the 12.5-13AFR range as I stay at WOT for a few seconds more. I have my carb on a dual plane intake on a bone stock 302 with the yellow spring in the secondary diaphragm and it doesn't bog when I floor it to WOT. Please let me know if you have a solution for this issue. Thanks, Roland

Awesome stuff! Thank you Randy!

WHAT IF YOUR HOLLEY 750 SECONDARIES ARE FLOODING BAD? AND RUNNING FUEL IN YOUR CARBURETOR? AND i CANT ADJUST THE FLOAT LEVEL AT ALL HIGHER OR LOWER? ITS FLOODED .SO BAD threw THE OVER FLOW TUBES A FEW TIMES.. I REPLACED.THE NEEDLE AND SEAT.WAS STILL NO Adjustment? I HAD IT RUNNING AT 6PSI.ON GAUGE. CARB IS ONLY.10 months.old. i am draining the oil and changing filter. Since there.may.be some.fule.got.in the oil pan.what.do i do??.please help!!!😂

I’m having trouble getting 14:1 cruise at 2500 rpm . 850 st Holley latest model . 408 Cleveland stroker , ported 3 v heads comp 294 b cam dur 250’s intake , 260’s exh. 106 lob centre , 105 int cent. 86 sec , 77 prim , 78 thou pvrc . Ib 76 hsb 35’s . Idle circuit.31 thou . Best I can get is 12.2:1 at cruise 2500 15” vacum . Could lean out the whole curve if I opened up the secondary blade stop ? Or should I lean out the idle circuit to .28 thou and the top ( billet metering block 3 hole) emulsion hole to .31 thou ? Has 6” vacum at idle . So just thinking that more air from the secondaries would lessen the transfer slot and lean out every thing . Looking at the T slot it’s more rectangle than square? Regards from Australia.