Which of these is correct for a 70 series 1?  I put the silver one on the more complete car.

 

 

black.heic silver.heic

6 minutes ago, z8987 said:

Which of these is correct for a 70 series 1?  I put the silver one on the more complete car.

 

 

black.heic 1.82 MB · 0 downloads silver.heic 1.95 MB · 0 downloads

 

The 2400 valve cover is the correct one in the 2nd picture.

14 minutes ago, S30Driver said:

The 2400 valve cover is the correct one in the 2nd picture.

That's what I thought. Thank you. 

What's the best way to clean this up. I'm not sure that I want it to shine, unless that's the only choice.  

You can use walmart brand oven cleaner and a local hot water car wash spray.Then aluminum polishing wad or similar. That'd be closer to oem finish. 

I bead blasted mine and 400? grit sandpaper over the NISSAN then cleared with satin high heat. But that was my preference. The oven cleaner and aluminum polish would be closer to original in my opinion.

You could also toss it in a hydroblasting cabinet and clean it up that way.  There's a guy in this area who has done that with good results (they really do look nice when he's done).  He's just using a homemade hydroblasting cabinet, there are plenty of guides on the internet to build one.

Dry blasting the valve cover prior to vapor/ hydro blasting will yield it better looking.  

What about a buffer, something like this?


https://www.harborfreight.com/6-in-buffer-61557.html


Sent from my iPhone using Tapatalk

The valve covers are cast aluminum and the original finish is not polished but a dull, natural aluminum.  With age, the aluminum corrodes and that is most probably the finish you are dealing with.  When I rebuild engines, I take the blocks and machine parts to a machine shop that cleans the parts, engine block and such, in their cleaner tanks.  That is how I get my aluminum back to the natural finish.  Soda / hydro blasting will provide a similar finish.  Media blasting will pit the surface.  If you polish the surface, the aluminum will loose its dull, natural finish and become chrome bright, silver shiny.  The more you polish, the more shiny mirror finish you will get.

The valve covers are cast aluminum and the original finish is not polished but a dull, natural aluminum.  With age, the aluminum corrodes and that is most probably the finish you are dealing with.  When I rebuild engines, I take the blocks and machine parts to a machine shop that cleans the parts, engine block and such, in their cleaner tanks.  That is how I get my aluminum back to the natural finish.  Soda / hydro blasting will provide a similar finish.  Media blasting will pit the surface.  If you polish the surface, the aluminum will loose its dull, natural finish and become chrome bright, silver shiny.  The more you polish, the more shiny mirror finish you will get.

Great points, thank you.


Sent from my iPhone using Tapatalk

Here's some things I remember reading on the stock covers. Same

as @26th-Z said.