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Mike Carr · 04-13-2014, 10:23 AM

You will have to see what IHRA rates that particular 307 at. I believe the factory rating was 145 or so. IHRA rates a motor different, at times, between traditional Stock and Pure Stock. Shipping weight divided by IHRA rating = the cars natural class. From there, you can move up one class or down one class. You take the top weight break for each class multiplied by the IHRA rating + 170 pounds to get the minimum weight, with driver, across the scales. If the shipping weight/horsepower = 14.xx, it will run G/PS, and can also run F and H To run G, you take 14.00 x IHRA rating + 170 = min wt.

I wrote this a few years ago, lists all the weight breaks for NHRA/IHRA Stock and Super Stock: http://classracer.com/classes.html

04-13-2014, 10:23 AM	#7
Mike Carr VIP Member Join Date: Nov 2001 Location: Enon Valley PA Posts: 1,650 Likes: 234 Liked 83 Times in 37 Posts	Re: Newbie to Pure Stock You will have to see what IHRA rates that particular 307 at. I believe the factory rating was 145 or so. IHRA rates a motor different, at times, between traditional Stock and Pure Stock. Shipping weight divided by IHRA rating = the cars natural class. From there, you can move up one class or down one class. You take the top weight break for each class multiplied by the IHRA rating + 170 pounds to get the minimum weight, with driver, across the scales. If the shipping weight/horsepower = 14.xx, it will run G/PS, and can also run F and H To run G, you take 14.00 x IHRA rating + 170 = min wt. I wrote this a few years ago, lists all the weight breaks for NHRA/IHRA Stock and Super Stock: http://classracer.com/classes.html __________________ 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