Upgrade! 86 GT with LS4 and 4T65E swap (Page 4/4) fieroguru FEB 03, 05:31 PM quote Originally posted by JC86GT: First order of business is to finish the engine by installing the LS6 manifold I have acquired and the throttle body. This requires me to weld up the hole for the oil pressure sensor. I think you can cut that boss down some and just tap the hole for a pipe plug. Here is a picture of clearance to the LS6 manifold when they were doing the cut and weld mod vs. just eliminating the sensor from that area. Probably just need to shorten the factory boss by 1/8" to 1/4" and tap for a pipe plug.