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
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