Help Figuring GT Car Classification

Damn Yankee · 04-29-2009, 04:03 PM

I am considering either the 1964 comet 289/233HP combo with the Canfield Replacement Heads, or the 1968 Cougar 302/230HP with the same heads. This would be a stick car if I go forward. Where I am having trouble is figuring the weight as I am looking at putting this in a 1995-97 Ford Probe which of course never had the V-8. I do want to set it up for as lite as possible. Thanks in advance

Bill Harris · 04-29-2009, 06:52 PM

If you have access to Microsoft Excel, download this spreadsheet:

http://www.employees.org/~bhracing/g...ulator_1p2.xls

You can enter the shipping weight of the car, which you can get from the NHRA classification guide on their website, and the factored HP of the engine you want to run, and the spreadsheet will tell you what classes you can run and what the minimum weights are for each class.

Chris1529 · 04-30-2009, 07:06 AM

looks like you'd have to use 2808 as the shipping weight. I think you have to use the heaviest weight if not originally made with a v8

Bill Harris · 04-30-2009, 01:54 PM

For some reason I can't get into the NHRA classification guides. But if Chris's shipping weight number is right, you can run the following (all weights are minimums and include the 170lb driver adder):
289/233
GT/F @ 2616 Lbs
GT/G @ 2733
GT/H @ 2849
GT/I @ 2966
GT/J @ 3082

302/230
GT/G @ 2700
GT/H @ 2815
GT/I @ 2930
GT/J @ 3045
GT/K @ 3160

Damn Yankee · 04-30-2009, 04:22 PM

Thanks guy's I appreciate the help !!!

Damn Yankee · 05-02-2009, 11:24 AM

I looked at the NHRA classification and see the high end weight of 2808. I also was looking at the Boss 302 and see it hasnt been re-classified since 2002, would this be a viable option or would the HP rating of 295 kill the idea of running the car around 2700-2900lbs ?

Bill Harris · 05-03-2009, 08:45 AM

The Boss 302 engine in the Probe can run

GT/B @ 2677 Lbs
GT/C @ 2825
GT/D @ 2972
GT/E @ 3120
GT/F @ 3267

295 HP seems a little high for that engine, but it might work if you can find the heads without selling your soul. You can also write a letter to NHRA asking for a HP reduction on the engine which might be looked on favorably since there don't seem to be any running in competition right now. They might drop it to 287 or so on request.

Do you have a Probe suitable for RWD conversion? It's not going to be cheap to build.

04-29-2009, 04:03 PM	#1
Damn Yankee Junior Member Join Date: Jul 2007 Posts: 98 Likes: 3 Liked 0 Times in 0 Posts	Help Figuring GT Car Classification I am considering either the 1964 comet 289/233HP combo with the Canfield Replacement Heads, or the 1968 Cougar 302/230HP with the same heads. This would be a stick car if I go forward. Where I am having trouble is figuring the weight as I am looking at putting this in a 1995-97 Ford Probe which of course never had the V-8. I do want to set it up for as lite as possible. Thanks in advance

04-29-2009, 06:52 PM	#2
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Help Figuring GT Car Classification If you have access to Microsoft Excel, download this spreadsheet: http://www.employees.org/~bhracing/g...ulator_1p2.xls You can enter the shipping weight of the car, which you can get from the NHRA classification guide on their website, and the factored HP of the engine you want to run, and the spreadsheet will tell you what classes you can run and what the minimum weights are for each class. __________________ Bill Harris ex 2172 STK ex 2272 S/S

04-30-2009, 07:06 AM	#3
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Help Figuring GT Car Classification looks like you'd have to use 2808 as the shipping weight. I think you have to use the heaviest weight if not originally made with a v8 __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

04-30-2009, 01:54 PM	#4
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Help Figuring GT Car Classification For some reason I can't get into the NHRA classification guides. But if Chris's shipping weight number is right, you can run the following (all weights are minimums and include the 170lb driver adder): 289/233 GT/F @ 2616 Lbs GT/G @ 2733 GT/H @ 2849 GT/I @ 2966 GT/J @ 3082 302/230 GT/G @ 2700 GT/H @ 2815 GT/I @ 2930 GT/J @ 3045 GT/K @ 3160 __________________ Bill Harris ex 2172 STK ex 2272 S/S

04-30-2009, 04:22 PM	#5
Damn Yankee Junior Member Join Date: Jul 2007 Posts: 98 Likes: 3 Liked 0 Times in 0 Posts	Re: Help Figuring GT Car Classification Thanks guy's I appreciate the help !!!

05-02-2009, 11:24 AM	#6
Damn Yankee Junior Member Join Date: Jul 2007 Posts: 98 Likes: 3 Liked 0 Times in 0 Posts	Re: Help Figuring GT Car Classification I looked at the NHRA classification and see the high end weight of 2808. I also was looking at the Boss 302 and see it hasnt been re-classified since 2002, would this be a viable option or would the HP rating of 295 kill the idea of running the car around 2700-2900lbs ?

05-03-2009, 08:45 AM	#7
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Help Figuring GT Car Classification The Boss 302 engine in the Probe can run GT/B @ 2677 Lbs GT/C @ 2825 GT/D @ 2972 GT/E @ 3120 GT/F @ 3267 295 HP seems a little high for that engine, but it might work if you can find the heads without selling your soul. You can also write a letter to NHRA asking for a HP reduction on the engine which might be looked on favorably since there don't seem to be any running in competition right now. They might drop it to 287 or so on request. Do you have a Probe suitable for RWD conversion? It's not going to be cheap to build. __________________ Bill Harris ex 2172 STK ex 2272 S/S