What size is the distributor hold down bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 06-15-2024, 01:56 AM

Is it distributor hold down bolt 1/2 or 7/16?

Thanks

**Dashman** · 06-15-2024, 09:43 AM

It should be 3/8-16 with 9/16 hex head.

1967GMCC20 · 06-15-2024, 09:54 AM

OEM 3/8 but various lengths, depending on distributor, clamp style, and manifold.

Always check that distributor has clearance to oil pump shaft by installing without gasket. Should sit flush on manifold, then, add your distributor gasket.

**71CHEVYSHORTBED402** · 06-15-2024, 11:49 AM

Mine has a: (GR 5) 9/16” hex flange head bolt. The bolt threads are 3/8-16 x 9/16”, and the head is stamped “E”.

**Already Gone** · 06-15-2024, 12:00 PM

From experience use a factory bolt and clamp as some of the aftrmarket ones are crap and will loosen and let your distributor move around.

1967GMCC20 · 06-15-2024, 12:25 PM

Quote:

Originally Posted by Already Gone

From experience use a factory bolt and clamp as some of the aftrmarket ones are crap and will loosen and let your distributor move around.

Factory clamps are always better.

skokie · 06-15-2024, 01:50 PM

Thanks for the info. Going to pick up a set of these when I need to adjust timing etc.
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

RustyPile · 06-15-2024, 04:13 PM

Quote:

Originally Posted by skokie

Thanks for the info. Going to pick up a set of these when I need to adjust timing etc.
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

Why go to the internet and wait a week and possibly pay shipping??? O'Reillys, NAPA, CarQuest and most parts suppliers have them on the shelf for immediate purchase...

1967GMCC20 · 06-15-2024, 04:23 PM

Quote:

Originally Posted by RustyPile

Why go to the internet and wait a week and possibly pay shipping??? O'Reillys, NAPA, CarQuest and most parts suppliers have them on the shelf for immediate purchase...

Not to mention every flea market, swap meet.

skokie · 06-15-2024, 07:15 PM

Quote:

Originally Posted by RustyPile

Why go to the internet and wait a week and possibly pay shipping??? O'Reillys, NAPA, CarQuest and most parts suppliers have them on the shelf for immediate purchase...

Yep. Just threw that out there as what I was looking for.
Thanks!

**71CHEVYSHORTBED402** · 06-16-2024, 01:28 AM

Quote:

Originally Posted by skokie

Thanks for the info. Going to pick up a set of these when I need to adjust timing etc.
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

Mine is similar the bottom one, it's ancient and does the trick. If I remember right, it's the only tool I have that remotely works for the lower RH hood hinge bolt with the blower and inner fender mounted.

06-15-2024, 01:56 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	What size is the distributor hold down bolt Is it distributor hold down bolt 1/2 or 7/16? Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

06-15-2024, 09:43 AM	#2
Dashman Active Member Join Date: Apr 2021 Location: Santa Cruz, NM Posts: 114	Re: What size is the distributor hold down bolt It should be 3/8-16 with 9/16 hex head.

06-15-2024, 09:54 AM	#3
1967GMCC20 Registered User Join Date: Apr 2022 Location: Medina, Ohio Posts: 227	Re: What size is the distributor hold down bolt OEM 3/8 but various lengths, depending on distributor, clamp style, and manifold. Always check that distributor has clearance to oil pump shaft by installing without gasket. Should sit flush on manifold, then, add your distributor gasket.

06-15-2024, 11:49 AM	#4
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,320	Re: What size is the distributor hold down bolt Mine has a: (GR 5) 9/16” hex flange head bolt. The bolt threads are 3/8-16 x 9/16”, and the head is stamped “E”. __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

06-15-2024, 12:00 PM	#5
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: What size is the distributor hold down bolt From experience use a factory bolt and clamp as some of the aftrmarket ones are crap and will loosen and let your distributor move around. __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

06-15-2024, 01:50 PM	#7
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Re: What size is the distributor hold down bolt Thanks for the info. Going to pick up a set of these when I need to adjust timing etc. https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1 __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234



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