exhaust manifold bolts
Printed From: The Ford Torino Page
Category: Powertrain Specific Forum
Forum Name: Big Block Engine Forum
Forum Description: 429 and 460 engines
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=18156
Printed Date: 19-April-2024 at 3:09PM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: exhaust manifold bolts
Posted By: 1973gts
Subject: exhaust manifold bolts
Date Posted: 08-July-2019 at 3:37AM
|
I have been trying to find info on what size exhaust manifold bolts are for a 1973 ford 429 but can't find anything online as to what fits. It will be for ford exhaust manifolds and not headers. Thanks in advance - dave ------------- Dave - 1973 GTS N code |
Replies:
Posted By: 72FordGTS
Date Posted: 08-July-2019 at 12:04PM
|
They are 3/8"-16 threads. Originally a 1973 429 would have had 15 - 3/8-16 bolts 2 5/16" long 1 - stud and washer assembly - 3/8-16 3 7/16" long. If you are looking for something to be "correct" they do have repros, like this that would be pretty close to what you car should have had: https://secure.cougarpartscatalog.com/emb-d0oe0544.html" rel="nofollow - https://secure.cougarpartscatalog.com/emb-d0oe0544.html Otherwise, you could just use some quality fasteners of the same dimensions. I just used some grade 8 bolts with lock washers for my manifolds, mind you, I had the intention of replacing them with headers.
------------- Vince 1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
Posted By: californiajohnny
Date Posted: 08-July-2019 at 2:33PM
well the thing is with general bolts available, is they only come in 1/2" increments for length ------------- JOHN 74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
Posted By: 72FordGTS
Date Posted: 08-July-2019 at 2:57PM
|
I was able to get 1/4" intervals when I got my manifold bolts? Mine you I have a 335 series motor, but I got all my bolts, and they were just a tad shorter (maybe a 1/16" or so) than the originals. These should be close enough to replace the 2 5/16." https://www.homedepot.com/p/Crown-Bolt-3-8-in-16-in-x-2-1-4-in-Zinc-Grade-5-Coarse-Thread-Hex-Bolt-96788/203537833" rel="nofollow - https://www.homedepot.com/p/Crown-Bolt-3-8-in-16-in-x-2-1-4-in-Zinc-Grade-5-Coarse-Thread-Hex-Bolt-96788/203537833 ------------- Vince 1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
Posted By: 1973gts
Date Posted: 08-July-2019 at 3:17PM
|
Vince, if I am reading the ad correctly those bolts are presently unavailable. However Bolt Depot has 3/8 16 X 2 1/4 zinc plated grade 5 available for about 40 cents each. Zinc plated ok? ------------- Dave - 1973 GTS N code |
Posted By: 72FordGTS
Date Posted: 09-July-2019 at 11:21AM
Sorry, I just did a quick Google search for 2 1/4" bolts, so I didn't notice they were out of stock. I am sure you can get them from most places that stock bolts, including auto parts stores. I am sure you could get them in Grade 8 too, but that's probably overkill for a manifold. As for the zinc plating, OEM would have been just black oxide, which has minimal rust resistance. Zinc would be better for rust resistance and many aftermarket OEM style replacement manifold bolts are zinc coated, so I don't see a problem. Most of the Grade 8 bolts here are Cadmium plated, if you prefer that. You could also try to find them in stainless if you prefer. I used cooper antiseize on mine bolts.
------------- Vince 1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
1973gts wrote:Posted By: 1973gts
Date Posted: 09-July-2019 at 2:45PM
|
Thanks, Vince, we have a local old time hardware that I will be checking with, they usually have a good supply of quality US made hardware. ------------- Dave - 1973 GTS N code |