The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Best LS Swap Headers

Cledus Snow · 10-26-2019, 12:17 AM

I have a 1973 K20 (GMC K25) with a LS L96, 6l90 and a NP205 transfer case. I did a lot of research and found two headers that work without any modifications.

Schoenfeld Headers - (#1302LS1)

Speed Engineering Headers - (#25-1025)

I'm not sure how much frame clearance difference the 1970 K10 frame has compared to 1973 K20 frame, but the Speed Engineering headers fit really nice and tight next to the engine block with plenty of room between the frame.

The Schoenfeld Headers fit a little closer to the frame.

Both manufacturers say on their website that the headers fit 2WD frames only, but both fit great, with enough room to run your exhaust around the transfer case.

10-26-2019, 12:17 AM	#6
Cledus Snow Registered User Join Date: Nov 2018 Location: California Posts: 12	Re: Best LS Swap Headers - For a 4X4? I have a 1973 K20 (GMC K25) with a LS L96, 6l90 and a NP205 transfer case. I did a lot of research and found two headers that work without any modifications. Schoenfeld Headers - (#1302LS1) Speed Engineering Headers - (#25-1025) I'm not sure how much frame clearance difference the 1970 K10 frame has compared to 1973 K20 frame, but the Speed Engineering headers fit really nice and tight next to the engine block with plenty of room between the frame. The Schoenfeld Headers fit a little closer to the frame. Both manufacturers say on their website that the headers fit 2WD frames only, but both fit great, with enough room to run your exhaust around the transfer case. __________________ - Snowman 1973 GMC K2500 Sierra Grande Last edited by Cledus Snow; 10-26-2019 at 02:30 AM.