Originally Posted by efs69
Thanks for the info. I was looking at the Dynatech headers. what did you modify?
#1 primary. It contacted the adapter plate and mount. It also ran too close to the steering shaft (rack & pinion steering).
Another consideration is oxygen sensor clearance if you use a 4L80E transmission. There's less than 1/8" between the tip of the sensor and the 4L80E pan, which means that you have to remove the headers to install/replace the sensors.
Dynatechs have one of the better, if not the best collector sealing systems in the business.