67-72 4x4 big block headers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rsmarr1982 · 11-20-2012, 01:04 AM

im planning on puting a 454 in my 69 k20 . im having no luck finding headers to fit since we all know 67-72 4x4s didnt come with a big block . any one else out there done this swap what headers did you use? im think maybe 73-87 4x4 big block ones might work. im also gonna keep it manual trans will headers even work ? or will i have to go with manifolds?

**americanmusc1e** · 11-20-2012, 01:35 AM

looking at my Dad's stock 1972 K20 suburban I don't see how headers can even fit with a smallblock lol..

if the motor you are going with is not too wild you might look into shorty headers rather than full-length. It might make them quite a bit easier to fit...

**Yukon Jack** · 11-20-2012, 06:10 PM

Here's a link to a page on my website showing what I did with my 454 in my 69 K20.

rsmarr1982 · 11-21-2012, 01:18 AM

i didnt realize how much work this was gonna be ! small block maybe be the way for me to go for now. thanks

70custom20 · 11-21-2012, 10:12 AM

When I built my truck I was able to buy hooker super comp headers for it. I believe I paid somewhere around $350 for them (that was about 16 yrs ago) I believe you could also buy hooker comp headers as well. Unless they discontinued them, you should be able to buy the hookers.
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birdistheword · 11-23-2012, 08:34 AM

Also check the exhaust port shape. My truck I bought has a 454 in it with rectangular ports and round tube headers wich cause a bit of a nasty exhaust leak. The driver's side clears but the passenger side has a nice ground out portion for the header to clear that side. I bought the correct type of headers for it but the a bigger primary tube size so I now have to shim my engine up some and hope for the best.

72BBCK20 · 12-03-2012, 04:11 PM

I'm running F body BBC headers with an 86 K30 hydro clutch which I got the idea from this site. If you look closely I did need to have a 1 5/8" spacer machined to fit between the flange on the bellhousing and the slave cylinder. don't know if it changes anything but I am using the motor crossmember from the 86 K30 also.

Gobuffalo · 12-05-2012, 01:29 AM

Sanderson has a good set.
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11-20-2012, 01:04 AM	#1
rsmarr1982 Registered User Join Date: Jul 2010 Location: mogadore ohio Posts: 867	67-72 4x4 big block headers im planning on puting a 454 in my 69 k20 . im having no luck finding headers to fit since we all know 67-72 4x4s didnt come with a big block . any one else out there done this swap what headers did you use? im think maybe 73-87 4x4 big block ones might work. im also gonna keep it manual trans will headers even work ? or will i have to go with manifolds? __________________ 1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver)

11-20-2012, 01:35 AM	#2
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: 67-72 4x4 big block headers looking at my Dad's stock 1972 K20 suburban I don't see how headers can even fit with a smallblock lol.. if the motor you are going with is not too wild you might look into shorty headers rather than full-length. It might make them quite a bit easier to fit... __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

11-20-2012, 06:10 PM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: 67-72 4x4 big block headers Here's a link to a page on my website showing what I did with my 454 in my 69 K20. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

11-21-2012, 01:18 AM	#4
rsmarr1982 Registered User Join Date: Jul 2010 Location: mogadore ohio Posts: 867	Re: 67-72 4x4 big block headers i didnt realize how much work this was gonna be ! small block maybe be the way for me to go for now. thanks __________________ 1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver)

11-21-2012, 10:12 AM	#5
70custom20 Registered User Join Date: Dec 2007 Location: Quakertown Pa. Posts: 119	Re: 67-72 4x4 big block headers When I built my truck I was able to buy hooker super comp headers for it. I believe I paid somewhere around $350 for them (that was about 16 yrs ago) I believe you could also buy hooker comp headers as well. Unless they discontinued them, you should be able to buy the hookers. Posted via Mobile Device

11-23-2012, 08:34 AM	#6
birdistheword Registered User Join Date: Apr 2011 Location: Tacoma, Washington Posts: 236	Re: 67-72 4x4 big block headers Also check the exhaust port shape. My truck I bought has a 454 in it with rectangular ports and round tube headers wich cause a bit of a nasty exhaust leak. The driver's side clears but the passenger side has a nice ground out portion for the header to clear that side. I bought the correct type of headers for it but the a bigger primary tube size so I now have to shim my engine up some and hope for the best. __________________ Erik 1969 Chevy K20 6.0L/4L80E/NP205 1971 Chevy C30 Cheyenne Longhorn 454/TH400 1979 Chevy K30 dually currently in pieces

12-03-2012, 04:11 PM	#7
72BBCK20 Registered User Join Date: Jun 2012 Location: Montreal, Quebec, Canada Posts: 27	Re: 67-72 4x4 big block headers I'm running F body BBC headers with an 86 K30 hydro clutch which I got the idea from this site. If you look closely I did need to have a 1 5/8" spacer machined to fit between the flange on the bellhousing and the slave cylinder. don't know if it changes anything but I am using the motor crossmember from the 86 K30 also. Attached Images

12-05-2012, 01:29 AM	#8
Gobuffalo Registered User Join Date: Mar 2012 Location: Crestline, CA Posts: 225	Re: 67-72 4x4 big block headers Sanderson has a good set. Posted via Mobile Device



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