Valve height is NOT an adjustable thing, slick. Someone must have given you some severely wrong information. There is no way the "...valve height adjustments..." can be "...set backwords..."
New Toy- Stone stock '88 T-bird Sport in need of some TLC
1988 Cougar XR-7- HO/T-5 conversion, cracked block prevented from reaching full potential.
RIP '88 T-Bird....firstname.lastname@example.org...best sleeper in So. Jersey, now it's taking a permanent dirt nap.