Spring and valve upgrade question

[bigd1960]

Just bought a 600 cam for my 07 Mastiff. Planning on port and polish the heads. Should I change the springs and valves and if so what should I get? Thanks

 

[Little-Boo]

Just bought a 600 cam for my 07 Mastiff. Planning on port and polish the heads. Should I change the springs and valves and if so what should I get? Thanks

Do a search on here and see what others have done and what they are currently running that works best. John Sachs is an engine builder who enjoys an excellent reputation for his work on heads and engines. He is a member on here who has done work on several BDM engines. I would recommend you get in touch with him with you ideas and he can set you up. :2thumbs:

Carlos

 

[bigdogtech01]

Porting and not changing valves, guides, seats, springs
Yes, you will want to do all the above. Go with all S&S other than the springs. I would use Comp cams springs. http://www.vthunder.com/

 

[aspen874]

yes, what Carlos and Andrew said!!!

Seriously, if you are going to the top end might as well do it all while you have it apart. I did mine along with a Thunder Heart ignition, XXX card and a Dual Runner intake, I was very happy with the results.

 

[Olde Man]

Andrew,
Wow. Did you just cross over into the high performance application for the beehive springs discussion? If I am not mistaken they improve vale train stability problems with less spring pressure which is great for valve train wear. On the short side my BBC would develop a 5000 rpm miss when I broke an outer spring. If you broke a beehive would you deep six a valve? Has anyone broken a spring on a v-twin? Maybe not a concern. This should lead to some good discussion.

 

[bigdogtech01]

Andrew,
Wow. Did you just cross over into the high performance application for the beehive springs discussion? If I am not mistaken they improve vale train stability problems with less spring pressure which is great for valve train wear. On the short side my BBC would develop a 5000 rpm miss when I broke an outer spring. If you broke a beehive would you deep six a valve? Has anyone broken a spring on a v-twin? Maybe not a concern. This should lead to some good discussion.

I did not say anything about the beehive springs I'm not a fan of them myself, but I'm sure others run them and may not have any problems. IMO I feel the standard Comp springs using the Chromemoly retainers are the most reliable for a street motor. I have seen many S&S top retainers fail, due to the design. They have holes in the retainers, making them lighter I guess, but also makes them weaker than a solid.

 

[bigd1960]

Thanks a lot Andrew