This post is a compilation of parts, suggestions, tips, and practices to successfully swap an LS-based engine into an S10 Truck (2WD, and Blazer variants)
Most swappers generally underestimate the total costs and time for these conversions.
Keep the engine bay clean. Once the original engine is pulled out, spend $10.00 on some degreaser and a car wash pressure washer. Can of black paint is under $5.00
Since no truck is built the same, it is difficult to put a specific construction price on the conversion. Parts range from complete swap kits from CPW, to junkyard dog conversions (using take off fans, radiators, modified f-body exhaust manifolds, DIY wiring harnesses, etc.)
This will not cover every combination, but will primarily cover the installation of a Stock LS engine and either manual or auto trans in these trucks.
4WD:
With the exception of the oil pan and exhaust system, the 4WD swaps are essentially the same. This swap will require a custom or fabricated oil pan, fabricated exhaust system, vacuum lines, better cooling, etc. The exhaust may include modified F-Body manifolds or custom headers.
4WD swaps are more labor intensive. Clearances are much tighter. The front differential interferes with every “stock” LSx oil pan. Several swaps have been completed using H3 Alpha pans and dropping the differential by 3/4″
If the back side of the engine is in the same location as the back side of the 4.3, then the front and rear driveshafts will not require modification. However, if you move the engine backwards any (in order to gain clearance for the radiator and fans), this will require shortening the rear and lengthening the front driveshaft.
The 4WD S10 uses a remote oil filtration system, which is an advantage, but requires additional plumbing.
The skid plates (if they retained) hinder air flow out of the engine compartment.
Suppliers of shortie and long-tube headers state that their headers are for 2WD applications.
This will be a closed post, which will be updated for new and/or better suggestions/parts/techniques. (send me a PM for suggestions)
Each component of the swap is in a separate section:
Cooling
Harness
A/C
Exhaust
Mounts
Engine components
Front accessories
Fuel
Oil Pans
Suspension/brakes
Emissions
Transmissions
Engine Identification
Security