[Taco Time]

Originally Posted by Better Performance

My 2010 2SS L99 has some heat related issues that I'm wondering if anyone else with a similar build has experienced and has had any luck correcting. The configuration I'm working with is a hellion top mount 64 ball bearing kit with wrapped headers and coated down pipes. Engine is stock block sleeved, forged and thermal coated 427 with 1/2" head studs and trick flow CNC heads, and Stage 2 blower cam, belt driven crankcase vacuum pump. Fuel system is Squash dual fuel return with AEM rails and ID1300 injectors. E85 tune. 4L80 Trans with 2800 billet triple disc, driveshaft shop axles and propeller shaft, 3.45 gears with Wavetrac diff. Using methanol injection to cool boost. I have hood vents cut in. The issue I'm having is primarily the #3 plug wire. I relocated the coils below and was able to route all of the ignition wires with 90° accel ceramic boots below the headers except for #3. I started out with a 35° boot with heat shielding around the wire and routed the wire over the valve cover and down by the p/s pump. After a short drive with minimal thrashing, I would notice a misfire under a heavier acceleration, and found the wire had burned from the boot about 2 "up. It is my belief that the heat build up in the pocket of the pipes meeting the collector in that area is being pulled up through the hood vents in turn cooking this wire. The rest of the ignition wires are closer to the header than this one is and are fine. The second issue is the temp sensor is having issues as the under hood temps rise, sometimes setting an open circuit code.
My thoughts are to modify the header to accommodate the #3 wire to be able to have a 90° boot and run below like the others, and to relocate the temp sensor to the passenger rear cylinder head where there is way more clearance away from the header.
Any thoughts, or other problems experienced by anyone? One more thing I will add is that the heat wrap on the headers is deteriorating fairly quickly considering that the build only has a few hundred miles on it.

Your Trick Flow CNC heads. Is that a stock head that's been CNC'd or is that an aftermarket head that's taller than stock?