Fuel neck Wittek tower clamp sizing info - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1970cstblazer** · 10-03-2023, 08:54 AM

Posted this over in the classifieds with no response to this inquiry.

I have the info for the small vent hose clamp, which is a Wittek SG-26. Looking for the size of the two large tower main fuel hose clamps.

Pic for clarity

notsolo · 10-04-2023, 12:51 PM

Precision Tractor parts has 1 1/2" tower clamps....I don't remember is the tube 1 3/8" or the hose, O.D. of the hose would help.

best view · 10-04-2023, 07:32 PM

The hose is 1 3/8

**DeadheadNM** · 10-05-2023, 11:42 AM

Quote:

Originally Posted by best view

The hose is 1 3/8

That hose sure is pricey

best view · 10-05-2023, 07:43 PM

Pete thanks for reminding me

**1970cstblazer** · 10-06-2023, 07:10 AM

Still looking for someone with a 1969-71 filler neck setup and original clamps to provide the large clamp sizing info.

**1970cstblazer** · 10-09-2023, 06:58 PM

I figured out the correct size per GM parts catalogs, and verifying the size on one of my original clamps. Using the part number info for the hose 457516, I was able to find that the correct clamp is 1 15/16"- GM part number 9414933. I was able to clean one of my original clamps and saw a faint 1-70 build date and the 1 15/16" size stamped on it.

I purchased a pair of them from Marti, who produces them the most accurately as original, especially the alloy quality.

**1970cstblazer** · 10-13-2023, 07:12 AM

Received the repro Wittek clamps. I oiled them prior to tightening them. One tightened perfectly. The other was tightening crooked. After about 30 mins, I was able to get the clamp to evenly tighten down. While the appearance is authentic, the construction of these is flimsy as compared to the originals.

**DeadheadNM** · 10-13-2023, 07:43 PM

Thanks for sharing the details. I sure do like the look of tower clamps but they sure don’t tighten/seal like a worm drive clamp.

**1970cstblazer** · 10-14-2023, 07:10 AM

One advantage of the tower clamps is the entirely smooth clamping surface. The openings on a worm gear clamp can damage the hose.

The NOS Wittek SG-28 vent hose clamp I used tightened perfectly the first time, and was very sturdy. ALL of the repro "Witteks" I have used are made from an overly malleable steel. The originals were far harder, but seem to tighten easier and more reliably.

**1970cstblazer** · 05-07-2024, 11:18 AM

Back to the Wittek clamps..

I used genuine NOS 1969 dated Wittek tower clamps on the radiator hoses on my 1970 Blazer. They were night and day difference as compared to the soft junk that is being made and peddled as Wittek. The originals are made of a galvanized spring steel.

They are darker and not as pretty as the reproductions, but there was absolutely NO drama.

The real deal are also 10 times the cost! LOL

10-03-2023, 08:54 AM	#1
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Fuel neck Wittek tower clamp sizing info Posted this over in the classifieds with no response to this inquiry. I have the info for the small vent hose clamp, which is a Wittek SG-26. Looking for the size of the two large tower main fuel hose clamps. Pic for clarity __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

10-04-2023, 12:51 PM	#2
notsolo Registered User Join Date: Apr 2008 Location: Md Posts: 2,482	Re: Fuel neck Wittek tower clamp sizing info Precision Tractor parts has 1 1/2" tower clamps....I don't remember is the tube 1 3/8" or the hose, O.D. of the hose would help. __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=635605

10-04-2023, 07:32 PM	#3
best view Registered User Join Date: Apr 2009 Location: newbury new hampsire Posts: 2,162	Re: Fuel neck Wittek tower clamp sizing info The hose is 1 3/8

10-05-2023, 07:43 PM	#5
best view Registered User Join Date: Apr 2009 Location: newbury new hampsire Posts: 2,162	Re: Fuel neck Wittek tower clamp sizing info Pete thanks for reminding me

10-06-2023, 07:10 AM	#6
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Re: Fuel neck Wittek tower clamp sizing info Still looking for someone with a 1969-71 filler neck setup and original clamps to provide the large clamp sizing info. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

10-09-2023, 06:58 PM	#7
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Re: Fuel neck Wittek tower clamp sizing info I figured out the correct size per GM parts catalogs, and verifying the size on one of my original clamps. Using the part number info for the hose 457516, I was able to find that the correct clamp is 1 15/16"- GM part number 9414933. I was able to clean one of my original clamps and saw a faint 1-70 build date and the 1 15/16" size stamped on it. I purchased a pair of them from Marti, who produces them the most accurately as original, especially the alloy quality. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

10-13-2023, 07:12 AM	#8
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Re: Fuel neck Wittek tower clamp sizing info Received the repro Wittek clamps. I oiled them prior to tightening them. One tightened perfectly. The other was tightening crooked. After about 30 mins, I was able to get the clamp to evenly tighten down. While the appearance is authentic, the construction of these is flimsy as compared to the originals. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

10-13-2023, 07:43 PM	#9
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,449	Re: Fuel neck Wittek tower clamp sizing info Thanks for sharing the details. I sure do like the look of tower clamps but they sure don’t tighten/seal like a worm drive clamp. __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

10-14-2023, 07:10 AM	#10
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Re: Fuel neck Wittek tower clamp sizing info One advantage of the tower clamps is the entirely smooth clamping surface. The openings on a worm gear clamp can damage the hose. The NOS Wittek SG-28 vent hose clamp I used tightened perfectly the first time, and was very sturdy. ALL of the repro "Witteks" I have used are made from an overly malleable steel. The originals were far harder, but seem to tighten easier and more reliably. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

05-07-2024, 11:18 AM	#11
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,845	Re: Fuel neck Wittek tower clamp sizing info Back to the Wittek clamps.. I used genuine NOS 1969 dated Wittek tower clamps on the radiator hoses on my 1970 Blazer. They were night and day difference as compared to the soft junk that is being made and peddled as Wittek. The originals are made of a galvanized spring steel. They are darker and not as pretty as the reproductions, but there was absolutely NO drama. The real deal are also 10 times the cost! LOL __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

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