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2004 Chevrolet Colorado LS Conversion


Colorado LS Conversion
Engine Assembly... SKIP TO INSTALLATION >>

The Engine Build

(Continued)

After installing the front cover the pan can go on... making sure everything is properly lined up before torquing all the bolts down.

4.8 LR4 oil pan and pickup 4.8 LR4 cam and front engine cover

With the bottom end buttoned up, it's time to rebuild the heads. I cleaned the bare heads by a few cycles of soaking them in a tub of water and Aluma-Klean powder for an hour or so followed by scrubing with some engine degreaser before rinsing and then throwing them back in a fresh tub.

4.8 LR4 oil pan and pickup 4.8 LR4 cam and front engine cover

These heads use a two piece valve seal and spring seat setup. With the spring seat in place you can tap the valve seals in by placing either a seal install tool or just a 12 point 12 mm socket over the top of the seal. Brown seals for exhaust, black for the intake valves. After that the spring installation is pretty straightforward. These are new LS6 valvesprings from GM performance parts to match the cam, the old spring seats, retainers and locks can all be reused here.

4.8 LR4 oil pan and pickup 4.8 LR4 cam and front engine cover

With the heads done we are ready for final assembly. After installing the lifters I found that the head gaskets that came with my gasket set are pretty much garbage (flimsy material compared to stock) and don't align properly as you can see from close inspection to the gasket on the right here.

4.8 LR4 Lifters in place 4.8 LR4 cheap misaligned gasket

I made a quick run to Autozone who had these Fel-Pro head gaskets in stock... much better.

4.8 LR4 Fel-Pro Head Gaskets 4.8 LR4 Fel-Pro Head Gaskets

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