IHRA stock classification (Crate Motor)

Mike Carr · 02-04-2012, 12:21 AM

Shipping weight of the car/body style used (using the heaviest available gasoline engine), divided by the IHRA rating for the crate motor = weight break to determine your natural class.

1987 Camaro (I don't see a Berlinetta listed for '87) was 3,232 pounds, divided by 340 = 9.50. You would run the 9.50 pound class, which is H/CM. You could also run the 9.00 (G/CM) and 10.00 (I/CM) pound class(es).

For minimum weight for each class, take 9.00, 9.50 or 10.00 weight break x IHRA rating of the motor + 170 pounds = minimum weight, with driver, across the scales at the conclusion of the run.

G/CM 9 x 340 + 170 = 3,230 pounds
H/CM 9.50 x 340 + 170 = 3,400
I/CM 10.00 x 3.40 + 170 = 3,570

02-04-2012, 12:21 AM	#8
Mike Carr VIP Member Join Date: Nov 2001 Location: Enon Valley PA Posts: 1,650 Likes: 234 Liked 83 Times in 37 Posts	Re: IHRA stock classification (Crate Motor) Shipping weight of the car/body style used (using the heaviest available gasoline engine), divided by the IHRA rating for the crate motor = weight break to determine your natural class. 1987 Camaro (I don't see a Berlinetta listed for '87) was 3,232 pounds, divided by 340 = 9.50. You would run the 9.50 pound class, which is H/CM. You could also run the 9.00 (G/CM) and 10.00 (I/CM) pound class(es). For minimum weight for each class, take 9.00, 9.50 or 10.00 weight break x IHRA rating of the motor + 170 pounds = minimum weight, with driver, across the scales at the conclusion of the run. G/CM 9 x 340 + 170 = 3,230 pounds H/CM 9.50 x 340 + 170 = 3,400 I/CM 10.00 x 3.40 + 170 = 3,570 __________________ Mike Carr, Tri-State S/SS Association President Looking for 2015 S/SS Race Sponsors Contact me if interested buffdaddy_1302@hotmail.com (724) 510-5912