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
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Silvertop/Blacktop valve crossover
Silvertop/Blacktop valve crossover
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
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics
- oldeskewltoy
- Club4AG MASTER
- Posts: 2184
- Joined: Wed Jan 09, 2013 4:44 pm
- Location: Portland, Oregon
Re: Silvertop/Blacktop valve crossover
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
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
Enjoy Life... its the only one you get!
Building a great engine takes knowing the end... before you begin
Enjoy Life... its the only one you get!
Re: Silvertop/Blacktop valve crossover
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
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
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics
Re: Silvertop/Blacktop valve crossover
I am running ae101 valves in my ae111 head and it works fine.
Re: Silvertop/Blacktop valve crossover
I can confirm that it works just fine
Sent from my OnePlus
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
- Stance GR+ Coilovers
- Mishimoto Cooling
- T3 adjustable 4-bar, Panhard, traction brackets, tension rods
- T3 Short shift
- Manual rack conversion
- Blacktop electronics