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[Larry Hill]

If the lifter seat is and or the lifter is taller than the one used, the adjustment screw moves closer to the fulcrum changing the lift at the valve.
On head runner cc there is no rule in stock.

[Alan Roehrich]

I was told by 3-4 NHRA tech guys that they are pouring Stock heads at random, and collecting data to make a database.

[Jeremy]

Lifter push rods angle on a small Mopar and the Hemi's are very bad. If the correct lifter (with lots of clearance around the push rod)is not used the pushrod will hit the side of the push rod seat and cause the push rod to raise off of it's seat which will increase the lift.

[Jeremy]

Also: I cleaned the combustion chamber I was told to and they checked the dirty one next to it. Found out they use the common rounded off stroke number instead of the one that's carried out to the thousands, luckly I had pleanty of safety on both.

[bill dedman]

So, Jerry, are you going to appeal this on the basis of 1. the wrong lifter being used to check valve lift, and 2. no Stock runner cc's (port volume numbers) to adhere to?
Sounds like you'd have a pretty good case to me. But, what do I know?????????????

[Tom Moock]

Jerry, I got picked for tear down at topeka national, They had a fixture to put my lifter and pushrod in for actual length, then they put in there checking lifter and adjustable pushrod in the fixture and make it actual same length, then they check lift on the cam. Alan Roehrich I was told for 2009 on my motor 305 [416] same spec, as super stock [ no welding or grinding ] 165 intake, 59 exhaust as these are the old stocker spec, Tom

[Jeff Lee]

I would agree on the cam issue. However, I think if you've got 12 cc more runner volume than is called out for SS, nail-head valves and "new" valve job rules considered, there's more to the story. From what I'm reading, NHRA did right. But that's just my opinion...