03/18/24 1965-69 chevrolet 396 and 427 engines add intake manifold numbers.
Ford 2015-17 add 302-370hp to Mustang GT.
Mustang 2016-2019 Correct wheelbase.

02/14/24 Ford Cylinder head correection. 1987 302-150hp, 1987 302-200hp, 1987 302-225hp, 1991 351-205hp, 1991 351-205hp, and 1992 351-210hp.

01/18/24 2013-2015 Chevrolet 396-390hp piston configuration.

12/23/23 End of year 2023 HP updates.
End of year Tech Bulletin updates.
Added AAA/S, AAA/SA, FS/AAA new classes.

05/31/23 Correct SS/AH calculations

05/31/23 1968 Ford 302-230hp carb corrections

04/24/23 1) HP updates:
1987 Chevrolet 262 140hp

01/19/23 Add new SS/Q class

01/13/23 1) HP updates:
1968-69 Chev 396 325hp & 350hp
1962 Dodge 413 385hp

12/31/22 1) End of year 2022 HP updates.
2) 1969 Pontiac shipping weights updated.
3) 2023 Camaro added.

3/9/21 AHFS HP adjustments following Gainesville LODRS race:
2009-2013 Dodge 345 300hp increased from 300 to 322 in Stock automatic.

1/20/21 1) Mid January 2021 updates.
2) Additional HP and Tech Bulletin updates.
3) Acepted Products updates for 1/21/21.

12/28/20 1) End of year 2020 HP updates.
2) Recalculate GT classifications.
3) Several additional database updates.

9/16/20 1) Ford Boss 302 1969 & 70 updates.
2) Corrected stroke specifications on several Chevrolet engines.

8/24/20 Add 2021 Dodge Drag Pak to the classification system.

8/10/20 AHFS HP adjustments following Indy LODRS race:
2010 Mustang 330 500hp increased from 500 to 537 in Stock automatic.
2010 Ford Tech Bulletin updates

8/3/20 1968 AMC: Updated shipping weights and added full cylinder head casting numbers
2011-14 Ford 227: Intake casting numbers, cylinder head casting numbers

7/21/20 1969 Chevrolet: Updated shipping weights
1979 Ford: Updated shipping weights and added some model combinations to the Class Guide

3/30/20 1967-70 Chevrolets: Updated casting numbers for some 327 and 350 engines and changed SS & SSGT hp factors for 350-295hp & 300hp engines.

3/26/20 Added 2001 Ford Crown Vics and Grand Marquis.

3/23/20 Intake manifold number changes to 1983 Chevrolet 305 and '65-'67 Mopar 273-235.

3/9/20 Too many updates to list. All changes from 12/15/19 through 3/9/20, including end of year hp changes.

12/4/19 NHRA Tech Dept update to remove Edelbrock manifold from the accepted list for 65-67 MoPar 273-235hp engines for Stock.

11/3/19 AHFS HP adjustments following Las Vegas Dodge Nationals race:
2015 Camaro increased from 370 to 383 in Stock automatic.
1965 MoPar 273-180 increased from 166 to 172 in Stock manual for full-bodied Dodge & Plymouth.
2019 Ford Cobra jet 327-610hp increased from 610 to 630 in Stock automatic.

10/21/19 AHFS HP adjustment following the Rockingham LODRS race:
1987 Chevrolet 350-210/225hp increased from 290 to 300 in SuperStock GT FWD only.

9/17/19 NHRA Tech Updates:
1965-67 Pontiac casting numbers and pistons.
NHRA CG Updates:
1987 Firebird 305 GT HP correction.
AHFS Update:
94-96 Chev 265-200 increased from 222 to 230 for SS.

8/6/19 NHRA Tech Updates:
1) 1966-71 MoPar Street Hemi intake manifold additions.
2) 1968-70 Ford CobraJet 428 additional intake manifolds.

7/25/19 Lots of updates
1) Mid-year HP updates.
2) Ford Tech updates for 2011-2014 CJs, 1984-1987 L4 HSC engines, 1968 429 camshaft specs.
3) SSGT HP adjustments for 1974-76 Chev 400.
4) 1966-67 Street hemi HP adjustments.
5) 1973-74 Chev 350 intake manifold and head corrections.
6) 1973-74 Corvette HP adjustment follwing the Woodburn LORDS race.

6/18/19 AHFS HP adjustments following the Denver LODRS race:
1965 Chevrolet Corvette 327-350hp increased from 288 to 298 in Stock manual only.

5/28/19 AHFS HP adjustments following the Reading LODRS race:
2014 Ford Mustang 302-350hp increased from 372 to 385 in Stock Automatic.

4/16/19 NHRA Tech Updates:
1) 1963 MoPar Max Wedge Hi Comp 426-425hp increased from 403 to 409 in Stock.
2) 2015 Dodge 426-460hp increased from 460 to 466 in Stock automatic.
3) 2019 Dodge 392-390 increased to 413 across the board.

3/12/19 AHFS HP adjustments following Gainesville LODRS race:
1976 Ford Mustang 302-133hp increased from 158 to 167 in Stock.
2010 Ford 428-375hp increased from 422 to 436 in Stock automatic.

2/13/19 AHFS HP adjustments following the Winternationals:
1976 Ford Mustang 302-133hp increased from 153 to 158 in Stock.

2/4/19 Corrections and addtions published by NHRA For Class Guide and Tech bulletins.
2019 FSS cars and engines added for Ford, Chvrolet and Dodge.
Corrected shipping weight on 1978 Impala 305.

1/22/19 Corrections and addtions published by NHRA For Class Guide and Tech bulletins.

12/26/18 End of the Year AHFS HP adjustments and Competitor requests:
See the lists from NHRA here (AHFS list) and here (Competitor Request list).

11/5/18 AHFS HP adjustments following the LODRS Div 7 race in Las Vegas:
2016-18 Chev COPO 350-580hp increased from 580 to 617 in Stock auto.

10/23/18 AHFS HP adjustments following the LODRS Div 3 race in St Louis:
1973 Ford 302-138hp increased from 146 to 150 in Stock.
Changes to the Class Guide:
1978 Ford 302-139hp is Auto only in Fairmont and Zephyr.
1987 Camaro & Firebird 305-155/165hp is 262hp for Stock Auto.
1994-96 Chev 265-200hp is Auto only in SS/GT.
Changes to Tech Bulletins:
2012-15 Chev 427 cylinder heads.

10/1/18 AHFS HP adjustments following the LODRS Div 5 race in Great Bend KS:
2013-15 Chev COPO 350-350hp increased from 377 to 394 in Stock auto.

9/20/18 Corrections published by NHRA For Class Guide and Tech bulletins for 1976 and 1986 Ford 140 4-cyl.
Added and updated some items in the Accepted Products.

7/24/18 Corrections published by NHRA For Class Guide and Tech bulletins.
See the list of corrections for the Class Guide here and the list of Tech Bulletin corrections here

7/2/18 Mid Year 2018 AHFS HP ratings updates. More inconsistencies.

6/20/18 Update HP on 94-97 Buick Roadmaster LT1; add Z28 to 1983 Camaro CG page.

5/23/18 Addition of 2015 & 2017 Ford, along with added Approved Products

4/17/18 Reversal of AHFS HP adjustment following LODRS Div 4 race in Houston:
1970 Chevrolet 350-300hp in 1970 Camaro decreased from 296 to 286 for Stock auto.

4/16/18 Removal of the Jones Engineering head as an accepted replacement for 62-70 SBC.
AHFS HP adjustment following the LODRS Div 4 race in Houston:
69-70 Chevrolet 350-300hp in Camaros increased from 286 to 296 for Stock auto.
1990-91 Corvette 350-247 & 250hp increased from 273 to 282 for Stock auto.

4/10/18 AHFS HP adjustments following the LODRS Div 7 race in Las Vegas:
1976 Ford Mustang 302-133hp increased from 140 to 151 in Stock auto.

4/3/18 Updated NHRA Accepted Products data, specifically a new head for 1962-70 Chevolet small blocks that use a "double hump" head.

3/21/18 Reversal of AHFS HP adjustment following the Gatornationals at Gainesville, FL:
93-98 Chevrolet 350 LT1 in Camaros and Firebirds reduced from 370 to 358 for Stock auto.

3/20/18 AHFS HP adjustments following the Gatornationals at Gainesville, FL:
1) 93-98 Chevrolet 350 LT1 in Camaros and Firebirds from 358 to 370 in Stock auto.
2) 1070-71 Mopar 426 Hemi in 'Cudas and Challengers from 434 to 449, in Stock auto.
3) 1976 Ford Mustang 302/133 from 133 to 140, in Stock auto.
4) 1967 Shelby 428/355 from 382 to 395, replacement heads in Stock auto.

3/7/18 Reversal of AHFS HP adjustment following the Div 7 Phoenix race
1973 & 74 Pontiac Firebird 455/250 reduced from 321 to 310 for SS.

3/6/18 AHFS HP adjustment following the Div 7 Phoenix race and the Div 4 No Problem race:
Another 302 Ford hit. 1978 Fairmont-Zephyr raised from 141 to 146 for Stock Eliminator.
1973 & 74 Pontiac Firebird 455/250 raised from 310 to 321 for SS.

3/1/18 Updated various NHRA Accepted Products data, specifically a new head for medium riser Fords, runner volume specs for SS '69 AMXs and a new piston for 421 Pontiacs.

2/27/18 AHFS HP adjustment following the Phoenix Nationals:
Another hit for the 1986 Chev Pickup. 350-165 raised from 222 to 230 for Stock Eliminator automatic.

1/31/18 Updated various NHRA Accepted Products data.
See the list from NHRA here.

1/23/18 Some minor Tech Bulletin changes:
See the list from NHRA here.

1/18/18 HP factor corrections from NHRA due to some clerical errors. 1969 427 ZL1 Camaro and 1975 Chev 400-175.

1/1/18 End of Year 2017 Updates applied to the database.

11/6/17 AHFS HP adjustment following the Div 7 Las Vegas race:
Another 302 Ford hit. 1975 Mustang raised from 144 to 149 for Stock Eliminator.

9/20/17 AHFS HP adjustment following the Dallas Fallnationals race:
Another 302 Ford hit. 1974 Maverick and Comet raised from 146 to 151 for Stock Eliminator.

10/8/2017 Separated the A & G models of Buicks from 1964 thru 1987 so the pages would be easier to read.

9/20/17 NHRA Tech Dept HP adustment for '95 Buick Roadmaster LT1 engine to match the numbers for Chevrolet.

9/20/17 AHFS HP adjustment following the LODRS Woodburn, OR race:
Another hit for the 1978 Buick Regal 231-150hp raised from 160 to 167 for Stock Eliminator.

8/28/17 NHRA Tech Dept HP adustment for '64 289-210hp Comet from 197 to 200 for Stock.

8/22/17 AHFS HP adjustment following the Brainerd National race:
Another hit for the 1986 GMC pickup 350-165hp raised from 212 to 222 automatic, and the 1978 Buick Regal 231-150hp raised from 154 to 160 for Stock Eliminator.

8/15/17 NHRA Tech Dept HP adustments for '67 426-425hp Hemis, '68 Mustang Cobrajet, '79 Malibu 305-160hp, and '71 Corvette 454-365hp.

8/1/17 AHFS HP adjustment following the Sonoma National race:
Another hit for the 1976 Ford 302-133hp raised from 153 to 163 for Stock Eliminator for the Maverick, Comet, Granada and Monarch, thanks to the Grahams. The Mustang missed it again!

6/28/17 Corrections to Mid Year AHFS HP adjustments:
See the list from NHRA here.

6/27/17 Mid Year AHFS HP adjustments:
See the list from NHRA here.

6/21/17 A special thanks goes out to Rick Thomason for helping me by pointing out an error on the web site. Thanks, Rick!!

6/14/17 HP adustment to correct 1983 305/200 Chev and add a cylinder head to 2012-15 Chev 427/425-430 specs.

6/13/17 AHFS HP adjustments following the Summernationals at Englishtown:
1983-87 Chevrolet 305 with hp ratings from 155 to 200 from 263 to 275, Auto in Stock.

5/31/17 Change indexes for FGT/A and FGT/B. AHFS HP adjustments following D1 LODRS race at Reading, PA:
1) FGT/A index lowered to 8.80; FGT/B index lowered to 9.20
2) 2017 Chevrolet COPO 350/590 from 590 to 616, Auto in Stock.

5/16/17 2015-17 Dodge Hellcat added. Additional specs for 09-10 354-540 Dodge engine.

3/20/17 AHFS HP adjustments following the Gatornationals at Gainesville, FL:
1) 63-64 Dodge & Plymouth 383/330 from 280 to 292, All in Stock.
2) 2010 Ford Cobra Jet 352/285 from 349 to 361, Manual in Stock.
3) 2016-17 Chevrolet COPO 376/410 from 410 to 424, Auto in Stock.
4) 1978 Chevrolet 350/160 from 283 to 293, Auto in Nova, Omega, Phoenix in Stock.
5) 1994-96 Chevrolet 265/200 from 214 to 221, Auto in SS/GT.
6) 2014-15 Chevrolet COPO 350/530 from 542 to 560, Auto in Super Stock.
7) 2011-13 Dodge Challenger 392/380 from 389 to 402, Auto in Stock.

3/14/17 From NHRA Tech:
AHFS adjustment on the 2015 Dodge Drag Pak 354/530 from 530 to 558 for Stock auto. This is the iron block engine.

3/6/17 From NHRA Tech:
1) Add intake manifold number to 66-67 MoPar 273 180hp.
2) Clean up some hp factors for '77 Chev 350 170hp.
3) Clean up hp factors for '64 MoPar 426W 425hp.
4) Clean up hp factors for '70 Dodge Challenger 440 390hp.

2/10/17 2017 COPO Camaro and Mustang Cobrajet added.
Also updates to 2015 DragPak engine specs.

1/26/17 More 2016 End of the Year HP adjustments:
See the lists from NHRA here.

12/23/16 End of the Year AHFS HP adjustments and Competitor requests:
See the lists from NHRA here (AHFS list) and here (Competitor Request list).

12/15/16 From NHRA Tech:
Added new SS/GT and SS/FGT classes and indexes for 2017 season.

11/15/16 From NHRA Tech:
AHFS adjustment on the 1972 Pontiac Firebird 455/300 Ram Air from 340 to 352 for Stock auto

11/1/16 From NHRA Tech:
1) AHFS adjustment on the 2010 CobraJet 330/435 from 488 to 504 for SS auto
2) AHFS adjustment on the 2013-15 COPO Camaros 350/350 from 355 to 367 for Stock auto.

10/4/16 From NHRA Tech:
1) Add replacement cylinder heads to 80-92 Chev 305.
2) Add replacement cylinder head to 93-98 Chev 350 LT1.
3) Correct HP for 78-89 Mopar 318s and 360s w/ replacement heads.

10/4/16 AHFS HP adjustment following the Dodge Nationals at Reading, PA:
Supercharged 2016 Ford 302-133hp raised from 575 to 600 for Stock Eliminator. Automatic only.

9/27/16 AHFS HP adjustment following the D-7 LODRS race at Salt Lake City:
Another hit for the 1976 Ford 302-133hp raised from 138 to 149 for Stock Eliminator for the Maverick, Comet, Granada and Monarch. The Mustang missed it again.

7/27/16 From NHRA Tech: Add the 376-365hp engine to the 2015 Chev Tech Bulletin and the Camaro SS.

7/19/16 From NHRA Tech: Corrections to some Technical Bulletins:
1) 1971 Chrysler 318-230 intake manifold number.
2) 1988 Chevrolet 350-230 added a casting/part number for the throttle body.
3) 2016 Ford 302-385 added numbers for the throttle body.

6/28/16 Mid Year AHFS HP adjustments:
See the list from NHRA here.

6/7/16 From NHRA Tech: Corrections to the Classfication Guide
1970 Dodge 440-390 changed from 400 to 382 with automatic transmission in Stock classes for the Challenger.

6/3/16 NHRA Tech Department corrects the Class Guide change from earlier this week
1971 Chevrolet 454-425 with iron heads corrected back to 424 from 447 with automatic transmission in GT/Super Stock classes.

6/1/16 AHFS HP adjustment following the D-3 Jeg's Sportsnationals event at Bowling Green, KY:
1) A hit this time for the 1975 Ford 302-129hp raised from 134 to 140 for Stock Eliminator in the Mustang.
2) 1971 Chevrolet 454-425 with iron heads raised from 424 to 447 with automatic transmission in GT/Super Stock classes.

5/25/16 From NHRA Tech: Corrections to the Classfication Guide
1) 2016 Mustang wheelbase changed from 107.1 to 106.72.(How can you measure a wheelbase to hundredths of an inch?)
2) 1977 Chevrolet 350-170 in the Oldsmobile Cutlass changed from 287 to 270 for automatic transmission in Stock Eliminator. Buick Century/Regal using the same engine is still 287. Stick is 275.
3) 1971 Monte Carlo 454-425hp is changed to 414 in Stock Eliminator so it is the same as the Chevelle.

5/24/16 AHFS HP adjustment following the D-7 LODRS race at Fontana, CA:
A hit this time for the 1976 Ford 302-133hp raised from 133 to 138 for Stock Eliminator in every body style except the Mustang. Hmmmmm. . . . Strange pattern here - how is the Mustang dodging the bullet?

5/17/16 AHFS HP adjustment following the Summit Racing Equipment NHRA Southern Nationals in Atlanta, GA:
1975 Ford 302-129hp finally increased some from 129 to 134 for Stock Eliminator in the Mustang.

5/10/16 Additions to the Class Guide and Tech Bulletins:
2016 COPO Camaro added to the Class Guide and the 2016 Chevrolet race engines added to the Tech Bulletins.

5/3/16 AHFS HP adjustment following the LODRS Divisional race at Indy:
2013 Chevy Camaro with the 396-390hp engine manual transmission only raised to 414 from 404 for Stock Eliminator.

4/26/16 AHFS HP adjustment following the Z-Max Four-Wide NHRA Nationals at Charlotte:
Another hit for the 1986 Chevy Pickup, 350-165hp manual transmission raised to 203 from 212 for Stock Eliminator.

4/5/16 AHFS HP adjustment following the Denso Spark Plugs NHRA Nationals at Las Vegas:
Another hit for the 1975 Ford 302-122hp & 129hp raised from 152 to 164 for Stock Eliminator in every body style except the Mustang. Hmmmmm. . . .

3/21/16 NHRA Tech Department changes for engine specs.
1) Added MoPar cylinder head #P5155469 to 68-79 selected 318s, 340s and 360s for SS and 92-02 Dodge Trucks 318s and 360s for Stock Eliminator. This is a MoPar Performance replacement head for Magnum engines.
2) 1967 Ford 427-425 gets a couple of additional carburetors added.
3) 1977 Ford 302 122-137 hp engines get cylinder head and intake manifold casting numbers corrected.

3/21/16 AHFS HP adjustments following the Amalie Motor Oil NHRA Gatornationals at Phoenix:
2010 Ford Cobra Jet 352-285 hp raised from 338 to 349 for automatics in Stock Eliminator.

3/1/16 AHFS HP adjustment following LODRS action at Baytown and the Carquest Auto Parts NHRA Nationals at Phoenix:
1) Another hit for the 1975 Ford 302-122hp & 129hp has raised from 139 to 152 for Stock Eliminator in every body style except the Mustang. BJ, you need to find a Mustang body.
2) 2000 thru 2005 Chevrolet 207-170 & 180 hp raised from 174 to 180 in Stock Eliminator. Oldsmobile and Pontiac using the same engine is still at 173.
3) 2014 Ford 429-455 hp shootout Mustang raised from 455 to 484 in Stock Automatic only. Stick is still 455.

1/26/16 Second round of year end horsepower factor changes and tech bulletin changes are added. Seems they missed a few the first time.
See the list from NHRA here.

12/20/15 All the year end horsepower factor changes and tech bulletin changes are in!! See the list from NHRA here.

11/10/15 HP adjustment following LODRS Las Vegas
1) 1975 Ford 302-122hp & 129hp raised from 132 to 139 for Stock Eliminator in every body style except the Mustang.
2) 1981 Pontiac 301-200hp Firebird turbocharged engine raised from 225 to 233 in Stock Eliminator. A Neil Smedley legacy.

10/5/15 HP adjustment following Keystone Nationals
1) 2008 Ford CobraJet 330-425hp raised from 519 to 536 in Stock, automatic trans.
2) 2015 Dodge DragPak 426-460hp raised from 466 to 482 in Super Stock, automatic trans.

8/24/15 From NHRA Tech:
1) Corrections to 87-92 GM 305 ratings
2) 77 Cadillac 350 up to 203 in Stock
3) 74 Ford 302 up to 146 in Stock for Maverick & Comet
(Both the Caddy and the Maverick are still in U/SA, just a bit heavier.)

8/17/15 2015 Dodge supercharged engines added and class guide updated.

8/3/15 HP Corrections to calculations for the GT/Truck classes. Added text 'AB' to show deck clearances above the block.

7/14/15 Mid Year 2015 HP Updates from NHRA Tech added.

7/2/15 Database updates: 1987 262 V6 Chev engine specs added. Monte Carlo & El Camino weight breaks added for the engine.

5/26/15 Changes following the LODRS 1-2 Reading, PA race. 2009-10 426-450hp Dodge Drag Pak increased from 450 to 474 hp.

5/21/15 Tech changes to the accepted fuel list for Sportsman racers.

5/19/15 HP adjustment following the LODRS Norwalk race. 2013 302 supercharged Mustang hit again.

5/13/15 Corrections to calculations using different power factors for replacement heads. SS/GT can use engines from same year as car.

5/6/15 Database updates: 2015 Dodge added; added replacement cylinder heads for 68-71 340 MoPar and 87-92 305 Chev.

4/17/15 New Logo and New feature: Added flow data for some cylinder heads.

3/31/15 Stock HP changes after Charlotte: '68-'69 iron head 396-375hp auto and '93-'98 LT1 auto. Thanks, Guys!

3/24/15 That pesky 1978 302 Mustang got tagged again for 7 more hp.

2/24/15 2015 Chevrolet COPO data added to the database.

1/8/15 Additional AHFS HP factor changes for the end of the 2014 season.

NOTICE!! Updated 12/26/2014 Classification programming and database changes for the new FS, FSS and FGT classes is ready to use.

12/23/14 Classification for the new FS and FSS classes added.

12/19/14 End of year horsepower changes are added to the database. Check out how it affects your car!

NOTICE!! Updated 12/18/2014 NHRA has released all the end of the year horspower changes. See their lists here.

12/17/14 NHRA has published a new approved fuel list here.

11/19/14 Some minor database corrections and fix a programming bug. 2008-up Fords corrected.

NOTICE!! Updated 11/4/2014 NHRA has published amendments to the rule book that will go into effect on Jan 1, 2015. This is a preview of what the 2015 rules will be. Read their not-so-clear-and-understandable publication here.

10/10/14 Some minor database corrections and a change of the max overbore from .075" to .080" (Thanks, Al!)

9/16/14 Tech Specs Changes: 2011 Ford 302/325 & 380 piston dome specs updated.
Class Guide Change: 1982 Ford 302/157 is now manual only in Capri and Mustang.

9/2/14 Lots of changes from Indy:
1. Larry Hill's combo got hit with 29 hp! 1986 Chev Truck, 262/155 V6
2. The 86 Chev Truck 350/165 combo got 9hp.
3. The 2013 & '14 COPO Camaro 396/390 combo got 29hp in Stock.
4. The 2009 & '10 Dodge Drag Pak 345/305 Hemi stick combo got 32hp in Stock.
5. The 2009 & '10 Dodge Drag Pak 360/275hp combo got 9hp in SS.
6. '87-'92 Chev and Pontiac 305 hi-compression TPI combos got 10hp for SS/GT FWD.
For more info, go here.

8/19/14 2011-2013 MoPar 392-380hp added to the Tech Specs and added to the Class Guide for 2011-2013 Challenger.

8/12/14 Class Guide Changes:
1969 AMC 290-225 power rating changed to 210, SS only.
1986 Chev Truck different ratings for Man-Auto added.
1970 Dodge Dart/Challenger separated from full size cars.

8/5/14 Tech Specs Changes: 1978 Ford 302/139 carb specs added.

8/5/14 Tech Specs Changes: 1962 Pontiac updated for some intake manifolds and cylinder heads. (Thx, Bob Michaels!)