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73-87 Chevy _ GMC Trucks => Performance => Topic started by: biggietalls on August 04, 2011, 09:42:02 pm

Title: 4wd header ?
Post by: biggietalls on August 04, 2011, 09:42:02 pm

what sort of style of header do i need for a 77' 4wd? thought i knew what i needed but apparently i dont tried a set i had earlier and they both hit the motor mounts and the pass. side also hit my front driveshaft....

Title: Re: 4wd header ?
Post by: ehjorten on August 05, 2011, 08:41:11 am

I put in a set of Hedman Elite headers in my '77 K20.  They fit good, have 1/4" thick plate at the ports and have thicker wall tubing.  I would advice against the ball socket collector setup though.  They are constantly loosening up!  I have tried trick in the book to keep it from happening, but they start getting loose after about a month and I am back under there fighting them again.

Title: Re: 4wd header ?
Post by: beastie_3 on August 05, 2011, 11:51:30 am

I have a set of Thorley (not Dougs) headers and they fit great. They have thicker port flanges to help against warping.

Title: Re: 4wd header ?
Post by: westsidek20 on August 05, 2011, 12:02:25 pm

I'm working on my truck now (78 K20), haven't placed them in yet, but the guy's at summit said that Hedman would fit. I'm about two weeks away from getting the engine back in the truck. I will let you know how it went.  ::)

Are you replacing all the exhaust? tubing and muffler?