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X-TECH MAN · 08-26-2010, 08:30 AM

They do in MOST cases. Some HP factors are different (minor rating difference in most cases) so the shipping wt/class factor has to be re-calculated when running a combo as a natural NHRA style class car. When building a GT or Crate Motored combo you just use the shipping wts (same/same) to figure the class. The shipping wt never changes more than a couple of pounds no matter the HP factor. Just be sure to use the small block shipping wt for a small block combo and the big block shipping wt for a big block combo.

08-26-2010, 08:30 AM	#2
X-TECH MAN Banned Join Date: Dec 2007 Location: Lake Placid, Florida Posts: 3,203 Likes: 1,047 Liked 235 Times in 110 Posts	Re: Ihra stock car classification guide They do in MOST cases. Some HP factors are different (minor rating difference in most cases) so the shipping wt/class factor has to be re-calculated when running a combo as a natural NHRA style class car. When building a GT or Crate Motored combo you just use the shipping wts (same/same) to figure the class. The shipping wt never changes more than a couple of pounds no matter the HP factor. Just be sure to use the small block shipping wt for a small block combo and the big block shipping wt for a big block combo.