Originally Posted by twinturrbo406
Yes, i'm a Head Porter. But, i've never had the chance to work on any of these heads yet, so i'm forced to ask alot of questions. So how long did it take you to figure out where the valve should be in the Tiger Head ? Did you experiment with different locations, or just nail the first time ??
I don't know how much time, but moving valve locations is like everything else. You have to take into account MANY other variables that it may affect negatively. There are some general guidelines, but it depends on what you're trying to achieve. It can be EXTREMERLY application specific.
I do know that if the valve is in the wrong spot, you're DEAD!!! You can't overcome it, even if you wave a magic wand over it..
As far as the Tiger heads, I came up with a valve location on my own. Turns it out was extremely similar to the other cylinder head/engine builders who were working on them.
Jimmy's valves were not moved. It was not in the budget and/or timeframe.
If I moved them and welded up the chambers there would probably be another 40-60hp.
What heads do you normally work on?