Silvertop/Blacktop valve crossover

Army Fork
Club4AG Expert
Posts: 201
Joined: Mon Feb 04, 2013 10:34 pm

Silvertop/Blacktop valve crossover

Postby Army Fork » Thu Oct 01, 2015 9:34 am

So this is a question Google and many 4A guys I know can't seem to answer, and is fairly simple.

Do the silvertop and blacktop use the same valves? More specifically, can you use a blacktop valve in a silvertop? Do the keepers and springs work? Retainers?

I honestly can't seem to find an answer. If anyone knows, please chime in

Sent from my OnePlus
1984 SR5-GTS 20V ST/BT coupe.
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics

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oldeskewltoy
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Posts: 1915
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: Silvertop/Blacktop valve crossover

Postby oldeskewltoy » Fri Oct 02, 2015 7:18 am

I've now had 2 silvertop heads and one blacktop head apart....

The physical dimensions of the valves, retainers, spring seats, and keepers are all VERY similar. The valves use the same diameter stems, same diameter seats, same length, and as far as I can see a similar keeper grove at the top. I recently had to use some of my silvertop hardware so I could flow a blacktop head, and it all went together... at least as far as flowbench testing.

Now can you run them ..... that is a different question... maybe... likely.... but it wouldn't be the best solution
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

Army Fork
Club4AG Expert
Posts: 201
Joined: Mon Feb 04, 2013 10:34 pm

Re: Silvertop/Blacktop valve crossover

Postby Army Fork » Fri Oct 02, 2015 7:23 am

I've actually been directed towards a few different posts that lead me to believe that the valves are effectively identical. At this point I'm pretty certain I can run a mix of valves in my head and the engine will run without issue

Sent from my OnePlus
1984 SR5-GTS 20V ST/BT coupe.
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics

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Nomnom83
Club4AG Enthusiast
Posts: 62
Joined: Mon Jul 08, 2013 8:29 pm

Re: Silvertop/Blacktop valve crossover

Postby Nomnom83 » Sun Oct 04, 2015 8:34 pm

I am running ae101 valves in my ae111 head and it works fine.

Army Fork
Club4AG Expert
Posts: 201
Joined: Mon Feb 04, 2013 10:34 pm

Re: Silvertop/Blacktop valve crossover

Postby Army Fork » Mon Oct 19, 2015 7:28 pm

I can confirm that it works just fine

Sent from my OnePlus
1984 SR5-GTS 20V ST/BT coupe.
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics

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