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Author Topic: Holes in choke tower of Holleys? WHY?  (Read 1930 times)
69Z28-RS
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« on: August 23, 2013, 10:44:16 AM »

I've noticed a couple of Holley carbs with holes drilled in the choke tower.. such as the carb body in the ad below.   Why do people do this?  What's the purpose?

http://www.ebay.com/itm/Original-GM-Holley-4-Barrel-Carb-Body-List-3910-67-Z-28-Camaro-396-375HP-67-Date/350854798178?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D16802%26meid%3D773248289862953085%26pid%3D100005%26prg%3D7926%26rk%3D2%26rkt%3D4%26sd%3D350854795157%26
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
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L78racer
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« Reply #1 on: August 23, 2013, 10:51:28 AM »

that was for a rear squirter kit. it used tubes from the front squirter. a way to get a 'double pumper'.
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Jon Mello
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« Reply #2 on: August 23, 2013, 02:15:09 PM »

An example...

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Jon Mello
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69Z28-RS
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« Reply #3 on: August 23, 2013, 02:18:51 PM »

additional squirters was the only possible reason that occurred to me, but I couldn't remember having seen that before (or it had been so long I'd forgotten) *G*   Thanks...
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
BillOhio
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« Reply #4 on: August 26, 2013, 01:09:11 PM »

Very interesting. I looked at a 70 z that had holes but farther apart. Guy was 3rd owner and someone told him it was a california car and it had water injection at one time to pass smog test.  Thought it was odd
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1969 Z28, Burgandy, numbers matching, 12,900 miles
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69Z28-RS
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« Reply #5 on: August 26, 2013, 08:14:30 PM »

Water injection was one of the 'fixes' suggested back in the late 70's for keeping high compression engines running on lower octane fuels.  I briefly considered that and some other 'fixes', before I decided to just park/store my Z28 in 1980...  I even considered conversion to propane, but where do you put a propane tank in a Camaro?  Smiley
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Hot302
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« Reply #6 on: August 27, 2013, 09:06:13 AM »

If you had a carb with holes drilled in it like that is there any way to repair it and bring it back to normal ?
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Rick
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« Reply #7 on: August 27, 2013, 04:50:12 PM »

Devcon and replate it?
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ss jim
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« Reply #8 on: August 27, 2013, 06:43:22 PM »

I ran a Holley 780 (3310) with this set-up back in '72-73. I believe I used a Mr. Gasket kit. It also required the use of two meshing gears that bolted to the throttle shafts on the passenger side. Basically when the throttle was pressed all four barrels opened at the same time along with four shots of gas. It ran pretty good after the engine was warmed up. When cold, not so much. Jim
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69Z28-RS
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« Reply #9 on: August 27, 2013, 10:18:58 PM »

Devcon and replate it?

I'm unsure what Devcon is??  but I'd think you could use one of the low temp mild metal 'welder kits' and weld it up.. grind/sand it down flat, and then recolor it...??  but it would be a lot of work for an 'also ran' carb...
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
tmodel66
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« Reply #10 on: August 28, 2013, 12:16:31 AM »

Why not just buy a double pumper carb to start with?
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Daniel  
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« Reply #11 on: August 28, 2013, 01:20:42 AM »

Devcon and replate it?

I'm unsure what Devcon is??  but I'd think you could use one of the low temp mild metal 'welder kits' and weld it up.. grind/sand it down flat, and then recolor it...??  but it would be a lot of work for an 'also ran' carb...
  I think Devcon is very similar to JB Weld.
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Mike C.    NW - Illinois
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« Reply #12 on: August 28, 2013, 08:16:01 AM »

Devcon link

http://www.grainger.com/Grainger/DEVCON-Aluminum-Putty-5A456?gclid=CMSI5Z-coLkCFYOe4Aodh24A0w&cm_mmc=PPC:GooglePLA-_-Adhesives,%20Sealants%20and%20Tape-_-Putties-_-5A456&ci_src=17588969&ci_sku=5A456&ef_id=ULjywAAAEU5ytmqL:20130828131412:s
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MyRed67
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« Reply #13 on: August 28, 2013, 11:43:56 PM »

WOW !  Some expensive stuff, and you probably only need 1/2 oz..
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1967 Camaro  LOS  11A
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Mike C.    NW - Illinois
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« Reply #14 on: September 08, 2013, 04:12:40 PM »

Why not just buy a double pumper carb to start with?
I was doing that before holley came out with the four shooter. I have a letter here asking about the fuel volume problem I was having with the pump and they told me I was wasting my time. I ran this setup on AFBs for years before holley became the carb of choice for GM. AFB carbs were not a problem because they had a larger volume pump. they also had a perfect place for the second squirter in the secondary thermal vent. we won a lot of drag races till they caught on as on the holley I drilled the squirter discharge holes in the air cleaner stud boss that squirted into the secondary capped off with a air filter stud.   Cheesy
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new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08.
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