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JRyan · 12-12-2008, 12:24 AM

I don't know!!! My 2009 Rulebook states on page 104 under CYLINDER HEADS, "Cylinder heads are additionally restricted in that they must retain original-size valves at original angles +/- 1 degree and must be able to hold original head volume per NHRA Specifications." That kinda contradicts their "any valve job accepted" statement on the bottom of the section doesn't it?

In Superstock on page 114 under CYLINDER HEADS, it says, "Valves must retain stock angle; valve-stem angle, +/- 1 degee." Again, toward the bottom of the section, "Any valve job accepted".

I'm mystified? All this stuff was supposedly superceded by NHRA in prior year revisions; the wording under CYLINDER HEADS in both Stock and SS is different in the 2009 rules compared to those of 2008, yet when they revised the CYLINDER HEAD section, they failed to remove the contradictions of their own revisons when writing the 2009 Rulebook. Who proof-reads this s--t? Or doesn't "ANY" really mean "ANY" with respect to original valve/seat angles?

Jerry

12-12-2008, 12:24 AM	#3
JRyan Senior Member Join Date: Apr 2003 Location: Aberdeen SD Posts: 645 Likes: 30 Liked 112 Times in 31 Posts	Re: 2009 NHRA Rules I don't know!!! My 2009 Rulebook states on page 104 under CYLINDER HEADS, "Cylinder heads are additionally restricted in that they must retain original-size valves at original angles +/- 1 degree and must be able to hold original head volume per NHRA Specifications." That kinda contradicts their "any valve job accepted" statement on the bottom of the section doesn't it? In Superstock on page 114 under CYLINDER HEADS, it says, "Valves must retain stock angle; valve-stem angle, +/- 1 degee." Again, toward the bottom of the section, "Any valve job accepted". I'm mystified? All this stuff was supposedly superceded by NHRA in prior year revisions; the wording under CYLINDER HEADS in both Stock and SS is different in the 2009 rules compared to those of 2008, yet when they revised the CYLINDER HEAD section, they failed to remove the contradictions of their own revisons when writing the 2009 Rulebook. Who proof-reads this s--t? Or doesn't "ANY" really mean "ANY" with respect to original valve/seat angles? Jerry