Unless your on a tight budget I would use these instead of the stock manifolds.LS1 TRUCK - Schoenfeld Headers
I used the three wire sensor and it seemed to read right where it should besides factory gauges aren't that accurate to begin with. If you do use the three wire sensor method you can use the TPS sensor pigtail from your current TBI unit. Also one thing I don't like about the water pump taping method is that what if your water pump goes out and you don't have a way to tap the replacement right away? Gonna be running without knowing how hot your engine is for awhile.
Last edited by low91; 05-10-2010 at 12:39 AM.
1991 Silverado-L33 5.3L, 212/218 .557 .562 115+4, ASP under drive pulley,180* thermostat, 90mm truck intake w/ LS3 throttle body. Shoenfeld conversion headers and duel Flowmaster exhaust. Performabuilt LVL 1 transmission and 23-2500 stall converter.
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