The motor mounts are ancient and they rubber is as hard a rock, so I decided to change them out.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVU28n8gMIgAugE4AU2iiFCBYG1UcNn_KJ77N3a5CmrOt8rcfDxC3Yj55aUYjWG8ZzRUrYzOKELKyd4Ginx7IhunLx_UM4AYnA2s-GHDI-W97fM-D9kfzuVVz1juDBX_hyphenhyphenaPmPBbNvt_Lr/s400/temp_mount.jpg)
I took the pressure off the mounts by using a bottle jack, undid the bolts (VERY hard to access), and removed the motor mounts.
This is what they looked like:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgi1lHBpGU3_6TxTjWlD3H0tVNuS1pbETC4A7ajvwrOdqVdX6Pz3CZmRo0T1HuoLgCffoEpZQorYx4i-KzBxPHCLoJIFC2zS5gnxKBwB2wOOwHF_6vv8lkmfNye3CCOSgPtXzR-eEnHXQt/s400/old_mount1.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifZWvH8RLWYRQXtD9V8T-hCRWsVoiJupdS1_fVmChP5crW-yJaq9gYcTwSqqJ2GmvD-G4U9o9_y9bliU6eY38cIVSMFkbDfMBQr-9Fc4V1dtHrUf3sVHyQ3U81ROjRl0KaUUry3dbRRIY6/s400/old_mount_2.jpg)
Which is a problem because this is what NAPA said a 1980 C-10 motor (donor engine) mount should look like (upper half only):
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFPmJS5oEpaxYmbIYhrtvIeXs6Aw2PD8YL64FgnlIs6p7EEEa26nibl3xkRcZ-WCVjEZrSNa-SwTX_ciUl1JXzZ17nzAdoYuj6LRPylOabvIYmwtNjVy8UFYIedWJTQEWlGRlrfsFJGogG/s400/napa_part.jpg)
I need to go out and find the right motor mount now. Any ideas on what motor mount I should ask for? I'm pretty sure this truck originally came with a straight-6, not a V-8.
Also, FYI- a set of motor mounts should last most vehicles 100,000+ miles or at least a decade. These things are just ancient and it's one more thing contributing to the engine running rough.