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Old 06-19-2022, 08:03 PM   #29
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So did the 85 GM motorhome chassis have a roller cam or a flat tappet cam.
It makes a difference as to what oil to use.
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Old 06-19-2022, 08:26 PM   #30
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Originally Posted by F4Gary View Post
So did the 85 GM motorhome chassis have a roller cam or a flat tappet cam.
It makes a difference as to what oil to use.
Flat Tappet no question
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Old 06-19-2022, 08:54 PM   #31
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Originally Posted by EyezOpen View Post
Flat Tappet no question
Yep, roller didn't come out until the gen 6 block. There was a Gen 5 HO with roller cam, but otherwise it was still flat tappet. Gen IV was 1965, gen 5 was 1991 and gen 6 was 1996. The GEN 6 block is the one with all the bells and whistles. Of particular note, that had Vortec heads which were fast burn. Fast burn significantly improves efficiency, as well as preventing knock. The 502 was based on the Gen 6 block, although mine did not have the fast burn heads. (I didn't know any batter at the time)
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Old 06-20-2022, 06:59 AM   #32
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Originally Posted by sploke View Post
I'm prepping our new-to-us Revcon for some cross-country mileage this summer. It has a big block Chevy gas motor. The coach is a 1985, but it only has about 6k miles on it. I'm planning on doing an oil/filter change and swapping out all the belts. I'm considering doing a transmission fluid and coolant change as well, but not sure if its really necessary. On one hand, the motor's hardly even broken in with that kind of mileage, but on the other hand, its almost 40 years old and has been sitting for quite a while before we drove it the two hours home. Thoughts?
After years of Porsche restoration, we came to find that one of the worst things for a vehicle is sitting for long periods.

Change out all fluids

Oils become acidic, I just change ATF (only 5k miles), put on a transmission cooler and filter on my truck that has been sitting for 8 years.

Changed break fluid, differentials, ...., the truck has 200k miles on it

Have happy RVing, time to break in that baby
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