Difference between Silver top and Black top heads

1. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

   #1 23rd September 2009, 12:02

   Ive had a search, found a few threads but only limited info on them. And simple answers such as 8bhp.. also search.
   
   What i have found out is that the Black top heads are better/stronger, better for camming. They have different inlet manifolds.
   
   Not after stupid answers.
   
   Thanks
2. user_22749 Saxperience Post Whore Joined: Apr 2008 N.Wales Posts: 7746 e46 M Sport

   #2 23rd September 2009, 12:14

   One is black and the other is silver
   
   Sorry had to be said xx
   
   I think they have different internals, e.g: valves springs etc etc. And like you said the black top is stonger.
   Isnt there something to do with the roller and rocker versions? not an expert

   1 user thanked this post: Mochachino
3. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

   #3 23rd September 2009, 12:17

   Ok at least we got off to a good start.
   
   So valve springs are different on them?
   
   So now, hows the Black top actually stronger?
   
   Whats the advantage of roller over rocker cams or visa versa?
   
   And any more differences not mentioned yet?
4. SaxoMuffin Established Member Joined: Apr 2008 Reading Posts: 2045 iTB'd MK2 VTR

   #4 23rd September 2009, 12:17

   I'm not too up on this but I was speaking with John at GMC and the black top which is the non roller type rocker gear(correct me if I'm wrong) is alot more suitable for higher revs, which is why you can get better results from camming a black top..
   
   Therefore the roller type isn't really suitable for high revs...
   
   Hope it helps

   1 user thanked this post: Mochachino
5. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

   #5 23rd September 2009, 12:19

   Quote:

   Originally Posted by db_sax Ok at least we got off to a good start. So valve springs are different on them? So now, hows the Black top actually stronger? Whats the advantage of roller over rocker cams or visa versa? And any more differences not mentioned yet?

   Quote:

   Originally Posted by SaxoMuffin I'm not too up on this but I was speaking with John at GMC and the black top which is the non roller type rocker gear(correct me if I'm wrong) is alot more suitable for higher revs, which is why you can get better results from camming a black top.. Therefore the roller type isn't really suitable for high revs... Hope it helps

   Thats beginning to answer that question cheers can anyone explain further?
6. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

   #6 23rd September 2009, 12:23

   From looking at this also, and speaking to a few people the black top is as said better for higher revs and modified n/a engines,
   
   after building up a silvertop head for my boost project, i now wish i'd gone for a blacktop due to the fact the s1 106 inlet will only fit these and not the silvertop due to port spacings.
   
   are you looking to modify a blacktop engine?

   1 user thanked this post: Mochachino
7. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

   #7 23rd September 2009, 12:26

   I just scrapped in a blacktop lump for £8 lol. Ye could have had it for postage costs
8. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

   #8 23rd September 2009, 12:30

   Quote:

   Originally Posted by WIDE-VTR-TURBO From looking at this also, and speaking to a few people the black top is as said better for higher revs and modified n/a engines, after building up a silvertop head for my boost project, i now wish i'd gone for a blacktop due to the fact the s1 106 inlet will only fit these and not the silvertop due to port spacings. are you looking to modify a blacktop engine?

   I finding majority of this out now for a mate who is boostin his silvertopped engine, and he asked me what the difference is between the heads. He knows his stuff though, built dragsters fastest in europe, and builds alot of engines.
   
   Sounds like he will definatly need a black top then right? Hes going to fit some chevvy valve springs aswell he said.
   
   

   Quote:

   Originally Posted by Ben_Saxo I just scrapped in a blacktop lump for £8 lol. Ye could have had it for postage costs

   Lol he could have had that!
9. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

   #9 23rd September 2009, 12:41

   In my opinion, i'd go blacktop for boost and fit a s1 inlet!!
   
   Once you've gone black you never go back!!!
10. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

    #10 23rd September 2009, 12:43

    Quote:

    Originally Posted by WIDE-VTR-TURBO In my opinion, i'd go blacktop for boost and fit a s1 inlet!! Once you've gone black you never go back!!!

    
    haha lol, i might have to get him in touch with you on here or somthing.
    
    cheers for the help.
11. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

    #11 23rd September 2009, 12:44

    Citroen did lol. Crazy French bastids
12. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

    #12 23rd September 2009, 12:46

    no problem mate!!!
    
    Any idea of what spec he's going for?
    
    turbo? what boost etc?
13. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

    #13 23rd September 2009, 12:50

    Quote:

    Originally Posted by WIDE-VTR-TURBO no problem mate!!! Any idea of what spec he's going for? turbo? what boost etc?

    Not sure, il try and find out tonight though.
14. Mochachino Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card

    #14 23rd September 2009, 13:25

    Just spoke to him, hes gonna run a T25 with about 6psi, nothing too drastic with a 5th injector. Making his own manifold etc.
    
    He was sayin about the roller rockers that if you get the right valve spring lbs right then you can get them to work quite well aswell as he uses them type roller rockers on the chevvys alot.
    
    Hes just bought a silvertop head though yesterday. But hes syas hes gonna use it gently durin the day with a bit of fun at night, then once the pistons melt, hes gonna blacktop with the s1 rallye inlet, forged internals etc. So a bit late now for the OP question but, i still wondered anyway.
15. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

    #15 23rd September 2009, 13:41

    Ah right, sounds promising. Should produce a quick little motor there matey!!