1997 5.7LX EFI Gen +, heads are off having valve work done. Yes these are Vortec heads. Manual gives torquing procedure as 22lb-ft, then "angle torque" in degrees. What is "Angle torque"?<br />Also, local marina is saying not to use the head bolts over. That they are the kind that stretch. Is that correct? If so, do you recommend someong like ARP for replacements? And would they torque the same? Thanks in advance.