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Adger Smith · 11-16-2010, 10:30 AM

This is the exact quote of the rule about deck height out of the 2006 NHRA Technical Policies & Procedures
I don't think it has changed any since 2006. .

1.2 ENGINE BLOCK
1.2a STOCK AND SUPER STOCK
The deck dimension of the engine block can be either in or out of the block, provided that the
difference in the compression is made up with the cylinder head gasket. Example: if the spec is for
.002-inch deck and .020-inch gasket, and the actual measurement for the engine is .005-inch positive
deck, then a gasket must be at least .027 inches. The opposite is true if the deck is below the block on
an above the block spec, then the gasket may be thinner to the allowable total dimension.

11-16-2010, 10:30 AM	#3
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: deck height: This is the exact quote of the rule about deck height out of the 2006 NHRA Technical Policies & Procedures I don't think it has changed any since 2006. . 1.2 ENGINE BLOCK 1.2a STOCK AND SUPER STOCK The deck dimension of the engine block can be either in or out of the block, provided that the difference in the compression is made up with the cylinder head gasket. Example: if the spec is for .002-inch deck and .020-inch gasket, and the actual measurement for the engine is .005-inch positive deck, then a gasket must be at least .027 inches. The opposite is true if the deck is below the block on an above the block spec, then the gasket may be thinner to the allowable total dimension. __________________ Adger Smith (Former SS)