When replacing the exhaust manifold on a 1988 GMC Jimmy fullsize 350 5.7L does it have to be torqued certain specs?

Yes, absolutely. Exhaust manifold bolts on a 1988 GMC Jimmy 350 5.7L must be torqued to the manufacturer's specifications. Using the wrong torque can lead to:

* Leaks: Under-torqued bolts won't seal properly, leading to exhaust leaks.

* Broken Bolts: Over-torqued bolts can snap, making removal much more difficult and potentially damaging the manifold or cylinder head.

* Warped Manifold or Head: Uneven tightening can warp the manifold or even the cylinder head, leading to further problems.

Unfortunately, the exact torque specs aren't readily available online without a factory service manual for your specific vehicle. You need to obtain a repair manual for your 1988 GMC Jimmy with the 5.7L engine. These manuals provide detailed torque specifications for all fasteners, including the exhaust manifold bolts. You can find these manuals online (eBay, Amazon) or through automotive parts stores.

Failing to use the correct torque specification could lead to costly repairs down the line, so getting this information is crucial for a successful repair.