'72 Big Block k20 Headers - Need better fitting headers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**nitrosport_5** · 12-23-2013, 03:51 AM

Hey guys, Just getting my truck tore down to replace the cab and looking at the headers, I dont know if they are the correct size for the engine/truck, or if they were just a random set of headers shoe-horned in there. Also, I was told by the previous owner that the engine was moved an inch back, or forward, or upside down... i dont remember

. Is this somthing that would have been done to put a big block in a 4x4? I should have gotten pictures of how far the engine is from the firewall but didnt think of that until i was back at home.

Here are the pictures of the header fit. The engine is a 396 and someome has carved the frame to fit the headers. Not sure what headers they are, but is there any other headers that may fit better? Thanks in advance.

Bishops Trucks · 12-23-2013, 06:49 AM

I have a used set. I'll have to dig them out and get you a couple pics. They were in my '71 K10 bolted to a 396. My frame was never cut for clearance, maybe these will work for you.

**nitrosport_5** · 12-23-2013, 06:34 PM

yes please let me know! if they are in good shape I'd be interested in purchasing them if you wanted to get rid of em

ZombieWeinerDog · 12-23-2013, 07:55 PM

I use these: http://www.summitracing.com/parts/ho...1hkr/overview/

**nitrosport_5** · 12-23-2013, 08:25 PM

Quote:

Originally Posted by ZombieWeinerDog

I use these: http://www.summitracing.com/parts/ho...1hkr/overview/

on a BBC 4x4 with no frame contact issues?

ZombieWeinerDog · 12-23-2013, 09:45 PM

Quote:

Originally Posted by nitrosport_5

on a BBC 4x4 with no frame contact issues?

not a 4x4, but they fit well, sit a little lower than i wanted, and i had to modify my gmc pauls crossmember, but it wasn't hard.

k5kev · 12-24-2013, 10:46 AM

I have a 72 K20 Suburban that I put a 502 in, and tried 5 or 6 different headers for fitment. The only set that fit right was Hooker 2463. These have 1-3/4" primaries and 3" collector. Hooker 2817 looks to be the same exact headers, just with 1-7/8 primaries, but I never purchased and tried.

More than likely the previous owner moved the engine forward, as this helps and is typically needed to clearance the firewall to the big block valve covers and HEI distributer (if used). I moved my engine forward about an inch and still had to put a small dent in the firewall to clear the driver side valve cover.

**nitrosport_5** · 12-24-2013, 01:19 PM

thanks k5kev. that makes sense. I do have an hei setup on it currently.

**nitrosport_5** · 12-25-2013, 04:52 AM

I think I'll pick up a set of the 2463s. so since the engine is an inch forward, should the headers fit different than if it was back an inch? just trying to figure out why my frame needed trimmed. must have just been incorrect headers?

12-23-2013, 03:51 AM	#1
nitrosport_5 Registered User Join Date: Jul 2012 Location: St. John, Washington Posts: 618	'72 Big Block k20 Headers - Need better fitting headers Hey guys, Just getting my truck tore down to replace the cab and looking at the headers, I dont know if they are the correct size for the engine/truck, or if they were just a random set of headers shoe-horned in there. Also, I was told by the previous owner that the engine was moved an inch back, or forward, or upside down... i dont remember . Is this somthing that would have been done to put a big block in a 4x4? I should have gotten pictures of how far the engine is from the firewall but didnt think of that until i was back at home. Here are the pictures of the header fit. The engine is a 396 and someome has carved the frame to fit the headers. Not sure what headers they are, but is there any other headers that may fit better? Thanks in advance. Attached Images __________________ "Rusty" 1972 K20 Cheyenne Super, 496, A/C, Tilt, Tach, Buckets, 4l80e/NP205, 4" Rancho Lift, 35" BFG AT "Ramp Truck" 1972 C30 Ramp Truck 350, Air Bags, Factory A/C. "1968" C10 Shortbed project

12-23-2013, 06:49 AM	#2
Bishops Trucks KEEP ON TRUCKIN' Join Date: Jun 2005 Location: Sterling, Va. Posts: 5,730	Re: '72 Big Block k20 Headers - Need better fitting headers I have a used set. I'll have to dig them out and get you a couple pics. They were in my '71 K10 bolted to a 396. My frame was never cut for clearance, maybe these will work for you. __________________ JIM '97 GMC Sierra K1500 '95 Chevy Silverado C1500 '71 Cheyenne Z71 / LT1 & 4-Speed SWB K/10 Father/Son Project http://www.youtube.com/watch?v=4l689JKXPnA http://67-72chevytrucks.com/vboard/payments.php "LIVIN' FREE FOREVER"

12-23-2013, 06:34 PM	#3
nitrosport_5 Registered User Join Date: Jul 2012 Location: St. John, Washington Posts: 618	Re: '72 Big Block k20 Headers - Need better fitting headers yes please let me know! if they are in good shape I'd be interested in purchasing them if you wanted to get rid of em __________________ "Rusty" 1972 K20 Cheyenne Super, 496, A/C, Tilt, Tach, Buckets, 4l80e/NP205, 4" Rancho Lift, 35" BFG AT "Ramp Truck" 1972 C30 Ramp Truck 350, Air Bags, Factory A/C. "1968" C10 Shortbed project

12-23-2013, 07:55 PM	#4
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: '72 Big Block k20 Headers - Need better fitting headers I use these: http://www.summitracing.com/parts/ho...1hkr/overview/ __________________ 1972 longbed- 454 1967 shortbed- 355

12-24-2013, 10:46 AM	#7
k5kev New Member Join Date: Apr 2006 Location: Anaheim, CA Posts: 304	Re: '72 Big Block k20 Headers - Need better fitting headers I have a 72 K20 Suburban that I put a 502 in, and tried 5 or 6 different headers for fitment. The only set that fit right was Hooker 2463. These have 1-3/4" primaries and 3" collector. Hooker 2817 looks to be the same exact headers, just with 1-7/8 primaries, but I never purchased and tried. More than likely the previous owner moved the engine forward, as this helps and is typically needed to clearance the firewall to the big block valve covers and HEI distributer (if used). I moved my engine forward about an inch and still had to put a small dent in the firewall to clear the driver side valve cover. Last edited by k5kev; 12-24-2013 at 10:52 AM.

12-24-2013, 01:19 PM	#8
nitrosport_5 Registered User Join Date: Jul 2012 Location: St. John, Washington Posts: 618	Re: '72 Big Block k20 Headers - Need better fitting headers thanks k5kev. that makes sense. I do have an hei setup on it currently. __________________ "Rusty" 1972 K20 Cheyenne Super, 496, A/C, Tilt, Tach, Buckets, 4l80e/NP205, 4" Rancho Lift, 35" BFG AT "Ramp Truck" 1972 C30 Ramp Truck 350, Air Bags, Factory A/C. "1968" C10 Shortbed project

12-25-2013, 04:52 AM	#9
nitrosport_5 Registered User Join Date: Jul 2012 Location: St. John, Washington Posts: 618	Re: '72 Big Block k20 Headers - Need better fitting headers I think I'll pick up a set of the 2463s. so since the engine is an inch forward, should the headers fit different than if it was back an inch? just trying to figure out why my frame needed trimmed. must have just been incorrect headers? __________________ "Rusty" 1972 K20 Cheyenne Super, 496, A/C, Tilt, Tach, Buckets, 4l80e/NP205, 4" Rancho Lift, 35" BFG AT "Ramp Truck" 1972 C30 Ramp Truck 350, Air Bags, Factory A/C. "1968" C10 Shortbed project



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