Here are the rules:
8.50 Index - 1/4 mile racing, 16 car qualified field
1. .400 Pro tree heads up with 7 second auto start
2. Minimum weight 2800 lbs, N/A S/B -300 lbs B/B -200
3. Deep staging permitted but auto start will be on at ALL times. Courtesy staging advised.
4. Full bodied street appearing car only - No roadsters, altered, dragsters
5. Lettering allowed on windows only
6. NO full round or square tube chassis
7. Stock style front suspension (bolt on aftermarket parts accepted)
8. Tran brake & two step allowed
9. Throttle stop/controllers, delay boxes/devices PROHIBITED
10. Automatic shifters PROHIBITED
11. Mufflers mandatory, Turbos are considered mufflers.
12. Car & Driver must meet NHRA & track safety rules
13. Gasoline or alcohol only (Nitro prohibited)
14. Max tire size of 33 x 10.5w
15. NHRA Pro ladder
16. All entries must be driven under own power from shutdown to scales. Towing everywhere else is permitted
10.00 and 11.50 Index - 1/4 mile racing, 16 car qualified field
1..500 Pro tree
2. Full bodied street cars only. No race car lettering.
3.Finished interiors.
4. Lexan windows permitted.
5. Mufflers mandatory ( inserts are NOT mufflers)
6. Any tire suitable for racing, Must fit inside Wheelwells. Max tire size 30x13.5 D.O.T.,29.5x10.5 non w slick .
7. Gasoline only ( alcohol and nitro prohibited, E85 permitted)
8. Stock frame and back half cars permitted (full round or square chassis cars prohibited)
9.Tubs allowed. No Wheelie bars allowed.
10. Pnuematic and electric throttle stops prohibited
11. Delay devices prohibited ( 2step and trans brake allowed)
12. Any type power adder permitted.
13. NHRA Pro ladder
14. Deep staging permitted but auto start will be on at ALL times.
15. Full front bench seat or 2 front bucket seats mandatory
A diesel?
That is bracket racing, not Index racing.
And as far as bracket racing on a Pro Tree, I run that class at the Street Car Shoot Outs and the Yellowbullet...It is called Pro Dial.