1972 gmc jimmy BBC header ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Sandtrap9072** · 11-09-2013, 07:46 AM

So, i have a 1972 jimmy that has a 1973 454 in it with a turbo 400 trans. i recently took the long tube headers off to replace the gaskets due to a leak. my problem is that the headers continue to leak, the reason being is they are sq port headers on oval port heads. But this isnt the only problem that i have, the headers that are on it are the 69110 headman headers and barely fit between the frame rails. i want to replace the headers with the correct ones , but obviously these trucks never came with big blocks. I believe whoever put the big block in just took a hammer to firewall to make it clear and believe that it still sits on the orig 350 engine towers, but how do i know? I plan on putting a 350 back in it in the near future but is not in the budget right now. right now would like to find a header to fit in the mean time. ANYHELP would be awesome!

Thanks,

Nick

**Tom Vogel** · 11-09-2013, 11:04 AM

I would look for some regular cast exaust manifolds if your are going to switch motors in the future. Why buy headers?

**Sandtrap9072** · 11-09-2013, 11:58 AM

I guess i should rephrase that, when i mean near future. lol its gonna be a awhile!

David623 · 11-17-2013, 07:27 PM

If you are serious about putting a 350 back into the truck, I took the 350 out of my 72 as well as the turbo 350 tranny I would make you a heck of a deal. It needs to be rebuilt, but it was running when I parked it. I am up-grading to a 5.3 and a 4L60 E transmission hooked up to the old 205 transfer case.

ztk123 · 11-18-2013, 06:06 PM

I installed some headman elite ceramic coated shorty headers on my 71 2wd blazer w/454 400TH. I had to use a hammer on one tube on the passenger side header to clear the frame rail. I tried Sandersons but I could not get it in, thankfully they were any easy resell. Most of the good headers for this application are from 400-600. From what I remember headman's website was pretty helpful. Try looking at truck and or suburban w/ bbc applications. I don't rember exactly what part # I got. I do have the cast manifolds left from mine if you decide to go that route ($30.00).
Good luck,
Mike

11-09-2013, 07:46 AM	#1
Sandtrap9072 Senior Member Join Date: Apr 2012 Location: Michigan Posts: 389	1972 gmc jimmy BBC header ? So, i have a 1972 jimmy that has a 1973 454 in it with a turbo 400 trans. i recently took the long tube headers off to replace the gaskets due to a leak. my problem is that the headers continue to leak, the reason being is they are sq port headers on oval port heads. But this isnt the only problem that i have, the headers that are on it are the 69110 headman headers and barely fit between the frame rails. i want to replace the headers with the correct ones , but obviously these trucks never came with big blocks. I believe whoever put the big block in just took a hammer to firewall to make it clear and believe that it still sits on the orig 350 engine towers, but how do i know? I plan on putting a 350 back in it in the near future but is not in the budget right now. right now would like to find a header to fit in the mean time. ANYHELP would be awesome! Thanks, Nick

11-09-2013, 11:04 AM	#2
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,563	Re: 1972 gmc jimmy BBC header ? I would look for some regular cast exaust manifolds if your are going to switch motors in the future. Why buy headers?

11-09-2013, 11:58 AM	#3
Sandtrap9072 Senior Member Join Date: Apr 2012 Location: Michigan Posts: 389	Re: 1972 gmc jimmy BBC header ? I guess i should rephrase that, when i mean near future. lol its gonna be a awhile!

11-17-2013, 07:27 PM	#4
David623 Registered User Join Date: Oct 2012 Location: Plymouth In. Posts: 100	Re: 1972 gmc jimmy BBC header ? If you are serious about putting a 350 back into the truck, I took the 350 out of my 72 as well as the turbo 350 tranny I would make you a heck of a deal. It needs to be rebuilt, but it was running when I parked it. I am up-grading to a 5.3 and a 4L60 E transmission hooked up to the old 205 transfer case.

11-18-2013, 06:06 PM	#5
ztk123 Registered User Join Date: Mar 2013 Location: Louisville, KY Posts: 232	Re: 1972 gmc jimmy BBC header ? I installed some headman elite ceramic coated shorty headers on my 71 2wd blazer w/454 400TH. I had to use a hammer on one tube on the passenger side header to clear the frame rail. I tried Sandersons but I could not get it in, thankfully they were any easy resell. Most of the good headers for this application are from 400-600. From what I remember headman's website was pretty helpful. Try looking at truck and or suburban w/ bbc applications. I don't rember exactly what part # I got. I do have the cast manifolds left from mine if you decide to go that route ($30.00). Good luck, Mike



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