Quote:
Originally Posted by novassdude
You are proably right that the phrase should be "will and will not pass tech"
What will and what won't pass tech may be reality. But the fact remains if you or if you have someone do any of the above things to a cylinder head it is not a legal cylinder head. It may very well pass tech but it is still not a legal head. Until they change the wording of the rule doing any porting and covering it up is still not legal
Now on those same lines a good digitizer could easily take the guess work out of the situation. All you need is a real untouched head to get the numbers off. All the old cars people used the core shift as to why that would not work. But with these new factory race cars with the cnc ported heads from the factory. You should be able to know without a doubt if someone has changed the cylinder head. But none of that matters because Neither HRA is ever going to take following the rules they set seriously. Hence how they got to the mess they have now.
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I am going to use my motor as an example. I own many sets of 416 heads. And I can tell you that there are several different bowl shapes, straight from the factory. There are several sets that have a secondary cut in the bowl in additition to the factory bowl cut. Personally, I believe these were heads that were cast for a 1.72 valve and were opened up at the factory to accept a 1.84 valve as they needed them.
So which head would you use as a model?
I am told at a recent race, they pulled down three 305 motors. And I am told that all three heads looked different.
So how do you decide which head was wrong?
I don't want to speak for Wade, but I think his concern is simple. We have been given runner volumes. If we meet those volumes, all other measured items pass, and there are no grinding marks in our runners, shouldn't the head pass tech? At least that is the assumption many were under.
You say buy a digitizer. I say NHRA would need 8-9 of them minimum. And then they would need to train on how to use them. And then "which" head do you use as model?
I don't envy NHRA tech. We are a big pain in the a**. They work hard when we are having fun. We bitch when they do their job and we bitch when they don't.