Thanks Scott!! 
Hiya Q!! Thank You!!! ;D
Hey Matt!! LOL....I thought you were referring to my floor in the shop.....looks almost like the floor of the truck!!! Always up for seeing a good "forgotten" build!!!! Have at it!!!
Amidst the yard work, ball games and other family obligations, I squeezed a couple moments at the bench tonight. Here is where I went.
Back at it with the motor tonight. Beginning where I left off, I moistened the molded exhaust section with spirits and began to add some pigments. To change things up a bit, I am using some K4 True Rust for starters.
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True Rust is a nice colored Rust. I say this, because it is a pigment made from actual rust. I repeated the same process of spirits again and then added a couple random dabs of K4 Rust, which is slightly lighter to the reddish orange scale.
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Now we need to add the dirt and grime in the corners. Now on a working engine, it may be more dusty and have areas that are more fresh and wet with oil. For this, the motor has been neglected for a while and will have some oily sections but most will be oil stained dirt and rust.
Starting with some AK Dark Earth and Engine Grime, I made a sort of slurry. This will be applied in to the corners.
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You do not have to have the Engine Grime. A similar slurry can be created with with Burnt Sienna and Paynes Grey oil paints.
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Mixing the to will give the grimy color and the oil is thicker and can fill the cracks on the engine nicely. You can even add any dark pigment to the oils as well. This will give the oily dirt effect. By adding some spirits to the oils you can make the oily grime wash as well.
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Making sure to dab the grime mixture into the tight corners and areas that oil and dirt would have collected.
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Next I felt I needed to add a little wetter looking oil staining. I have a couple choices, AK Engine Oil and K4 Old Engine Oil. Again, this can be achieved with the oils. Don't wick the oils out on cardboard but rather leave the oils still with the pigment. This will keep a bit of shine to the mixture leaving a slightly damp appearance.
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I still have a couple more little things to add here, but basically that is the engine block!
I hope to get most of the truck assembled tomorrow and move on to more washes and streaking.
As always......
Thanks for stopping by!!