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**aotte1** · 12-05-2022, 08:46 PM

DUAL 2 1/2” EXHAUST

Tried dual exhaust systems for the 1986 K10, Walker/Thrush, they did not fit. Did not try 2.25, as want 2.5 mandrel. A couple of the issues are one, left side transmission 700R4 shift linkage that goes from the frame to the transmission - interference. For this issue your headers exit will effect how difficult an issue this is. These Headman Headers, which are very nice and exit higher up, are inline with the shift linkage. The right side has transfer case tight clearance, gas lines close to exhaust ( not sure of clearance specification, FAA has 2” for some applications). And dual fuel tank control/switch clearance along with several hoses.
Started from headers, added Headman collectors 2.5”, 18” long with 3.5” offset. Modified them along with other pipes. Made header to muffler pipe, by cut, fit, tac, confirm fit, weld.
Below are a few photos of the right side header to muffler, more to be posted soon. First two show Evolution 14/15” carbide saw, very nice square cuts, along with up to 45 degree cuts. And how pipes aligned and clamped for welds. 3 and 4 show a couple of welds, one is under the ring.

12-05-2022, 08:46 PM	#20
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	Re: 1986 K10 Short Bed Build DUAL 2 1/2” EXHAUST Tried dual exhaust systems for the 1986 K10, Walker/Thrush, they did not fit. Did not try 2.25, as want 2.5 mandrel. A couple of the issues are one, left side transmission 700R4 shift linkage that goes from the frame to the transmission - interference. For this issue your headers exit will effect how difficult an issue this is. These Headman Headers, which are very nice and exit higher up, are inline with the shift linkage. The right side has transfer case tight clearance, gas lines close to exhaust ( not sure of clearance specification, FAA has 2” for some applications). And dual fuel tank control/switch clearance along with several hoses. Started from headers, added Headman collectors 2.5”, 18” long with 3.5” offset. Modified them along with other pipes. Made header to muffler pipe, by cut, fit, tac, confirm fit, weld. Below are a few photos of the right side header to muffler, more to be posted soon. First two show Evolution 14/15” carbide saw, very nice square cuts, along with up to 45 degree cuts. And how pipes aligned and clamped for welds. 3 and 4 show a couple of welds, one is under the ring. Attached Images Last edited by aotte1; 12-06-2022 at 01:42 AM.