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Technical Discussion Forum For the discussion of technical questions about Professional Cars and their repair and maintenance. Posting in this forum is limited to PCS Members and / or Site Supporters. We encourage all website users to become members of the Professional Car Society and / or become Site Supporter.

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Old 08-26-2010, 07:34 PM
Douglas Smith Douglas Smith is offline
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Default 1973 472 exhaust manifold bolts ?

What length size and thread pattern are the 1973 Cadillac 472 exhaust manifold bolts? I looked around on a few forums and nothing came up. two of mine are broken off inside the head so I want to buy a full set before I try to get any others out and possibly break more. Will lowes or home depot have them in stainless?

Why did they make it impossibly to get to these bolts as well <.< I have to try and get the wheel well off and maybe the springs and shocks because all of that is right up against it to where you can't get anything but a tiny swivel type ratchet on it.
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Old 08-26-2010, 09:01 PM
Richard Vyse Richard Vyse is offline
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Quote:
Originally Posted by Douglas Smith View Post
What length size and thread pattern are the 1973 Cadillac 472 exhaust manifold bolts? I looked around on a few forums and nothing came up. two of mine are broken off inside the head so I want to buy a full set before I try to get any others out and possibly break more. Will lowes or home depot have them in stainless?

Why did they make it impossibly to get to these bolts as well <.< I have to try and get the wheel well off and maybe the springs and shocks because all of that is right up against it to where you can't get anything but a tiny swivel type ratchet on it.
I feel your pain. I had several break off on my 73 but that is an issue beyond my expertise so off to my mechanic. I was fortunate that mine broke off on the front part of the engine.
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Old 08-26-2010, 09:03 PM
Kevin M. Parkinson Kevin M. Parkinson is offline
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I'm not sure home depot or lowes has hardened grade bolts. I would find a shop that specializes in automotive hardware. They likely know what you need or can measure one that you have removed without breaking.
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Old 08-26-2010, 09:15 PM
Douglas Smith Douglas Smith is offline
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They all have said I have to get one that is not rusted out and all of mine are real 1973 rustouts :P They didn't know the sizes and suggested I ask on forums
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Old 08-26-2010, 10:36 PM
Michael Lee Michael Lee is offline
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Default remove head

I just replaced my manifold gaskets on my 1968 75, we removed the head and took the exhust manafold donut apart that left the head with the exhaust manafold still on the head.Then we took them to a mechine shop who used a torch to heat up the ones not broken off and were able to fix the ones broken off ones
My 68 it is to close to the fender to do anything with the bolts. it cost me a head gasket and a manafold pan gasket but every thing came out quickly and install was only a few hours. I got all the gaskets and the new harden bolts from my local auto parts store We will do the same thing on the hearse this winter.
CHECK THE LIFTERS my exhaust leak was so loud that I did not hear the bad lifter till after we got everything back together and with the motor running as quiet as a mouse execpt for the tap tap tap of a bad lifter .And like Richards ambulace the pour in magic stuff is not working
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Old 08-27-2010, 04:08 AM
Kenn Evans II Kenn Evans II is offline
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I don't remember the size and thread count, but I did enjoy the extra work in pulling the fenders and inner fenderwells to get to the manifolds. I would suggest heating them up with a tourch to cherry red then let them cool to black then using a ball pein hammer tap them once or twice then allow to cool a bit longer and then remove them. They will be hotter than hell but they come out fairly easy and then can be replaced. I broke off three and had to dissassemble the front of the car to drill and tap them out. My friends at the Chevy Garage told me to heat them up first and I didn't have any problems in removing the passanger side manifold bolts. I hope this info may help you and save on vocabulary lessons and embarrassing you-tube videos that may distort others views of ones personality.
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Old 08-27-2010, 11:18 PM
Douglas Smith Douglas Smith is offline
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Default extra problem!

I did find out the bolts SHOULD (still waiting on verification!) be 2 1/4in long with 1in of non threaded and they are 3/8-16 thread bolts. Get Grade 8 or stainless Steel. Lowes and Ace only have 2 1/2 but other than that they are correct.

MTS has the correct ones though. Another forum told me that the 2 1/2 can be used with a spacer or washer. Now I just have to take the car appart to see if I can get the broken ones out.

Looks like the bolts on the place where the stock manifold join the pipes are rusted almost completely off!! What size bolts and what threading are they? The manifold looks okay but those two bolts are done for. They also look to be different sizes and there are two of them.
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Old 08-28-2010, 12:04 AM
Paul Steinberg Paul Steinberg is offline
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The manifold studs to pipes are best cut and then removed from the manifold and replaced. Don't gamble breaking the manifold trying to take the pipes apart from the manifold on the car. Cut them with a hack saw or torch..
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Old 08-28-2010, 12:08 AM
Douglas Smith Douglas Smith is offline
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I didn't think those are replaceable?
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Old 08-28-2010, 12:24 AM
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Daniel Scully Daniel Scully is offline
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Here is one source and they have a flange on the end.

Or I have a oem set for $25.00 plus shipping.
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1965 C/B Landau
1968 Crown Royale 3-way
1975 M-M Criterion
1996 Eagle Coupe de Fleur

1964 Dodge 880 Hardtop Wagon
1973 VW Thing
1968 A-100 Truck
1970 300 Convertible
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