Muscle Mustangs & Fast Fords
1993 Ford SVT Cobra Project Stolen Goods - Dyno Tested, Owner Approved
Project Stolen Goods Hits The Dyno And Then The Road.
On Naegele's recommendation, we used some White-Out tape and our Comp Cams pushrod checker tool to see where the roller was riding on the valve tip. He pointed out that having the roller centered is only part of the adjustment equation, as you also need to take into account the amount of sweep across the tip as well as where the sweep centers itself.
With the 6.85-inch pushrods we were using, we noticed the sweep to be located towards the exhaust side of the head. Running the assembly with the checker tool at 6.75 and 6.70 inches moved the sweep towards the intake where it needed to be. We also noticed that the width of the sweep decreased as the pushrod length was shortened. This is a better scenario for the valve as it doesn't create as much side-loading force.
At this point, we're looking at ordering a shorter set of pushrods, but we also need to perform a leak-down test to make sure the intake valve has not been damaged in any way. We performed a compression test and found no compression whatsoever in cylinder No. 7, which may be a result of using the incorrect rocker-arm stud and/or incorrect pushrod length. Either way, we'll have this mystery sorted out for the next installment, and we'll fill you in on the details.
Now that we've had a taste of what Stolen Goods has to offer, we're looking forward to getting the snake slithering on the nearest track.