torque specs

[jdjim]

rebuilding 98 k1500 with 5.7l. notice my chilton manual shows different torque specs then what the machineshop/engine builder told me. he gave me straight torque specs but the manual shows 96 and later use a torque turn method. should i trust the engine rebuilder or the chilton manual, ive found the chilton manual to be wrong before. if i do torque turn method do i need to replace head bolts and rod bolts? does anybody know for sure on the 98? thanks.

[toddman67]

The torque specs in the manual are not always up to date and are for the use of new bolts and hardware. It is always a good practice to use new hardware due to the bolts being strectehed during the torque process. Using them over will have a loss in clamp load. If you had machine work by an engine builder then I would listen to him, especially if he is going to stand behind his work.
NEW bolts and hardware always recommended.

[rovertec1958]

The chevrolet shop manual says to replace all head bolts as they are stress bolts . specs. show to tighten all bolts in sequence to 22 ft./lb.
tighten the short bolts an additional 55 degress , the medium length
bolts an additional 65 degrees and the long bolts an additional 75 degrees . hope this helps .