Lead Foot City joins NHRA Member Track family in Division 2
Neonetics partners with NHRA to light up the racing world
TV schedule: Enjoy NHRA on FOX Drag Racing highlights through December
Reigning Top Fuel champ Antron Brown extends partnership with Matco Tools
Mike Coughlin set to make NHRA Mountain Motor Pro Stock debut in 2025
As it looks to a long future, Firebird Motorsports Park repaves its dragstrip
Blake Alexander, Greens announce second Funny Car team at PRI Show
Pedregon inks multiyear extension with Bunker to continue as crew chief
2024 NHRA National Dragster All-Star Team honored at PRI trade show
2024 PRI Show recap: Three days of major NHRA announcements and plans
Josh Hart Racing adds Snap-on Tools for 2025 Top Fuel season
Spencer Hyde to drive Funny Car for Jim Head Racing in 2025
PJH Trackbite named official traction compound of NHRA
Red Line Oil named presenting sponsor of NHRA Crew of the Year award
Old World renews with John Force Racing; Jack Beckman to drive again in 2025
NHRA, zMAX Dragway announce first-ever four-wide Countdown race in 2025
Dates set For Right Trailers NHRA Jr. Drag Racing League Conference Finals
NAPA named Official Auto Parts store of NHRA in first-time partnership
Lucas Oil set to continue as title sponsor at famed Indianapolis Raceway Park
NHRA announces launch of 75th Anniversary campaign for 2026 season
Right Trailers and LB Trailers announce their 2025 motorsports team at PRI
NHRA releases 2025 schedules for specialty classes
NHRA, FOX Sports release 2025 Mission Foods Series television schedule
NHRA releases Pro Stock and Pro Stock Motorcycle schedules for 2025 season
91°µÍø Peach State Showcase of Speed event set for South Georgia Motorsports Park
NHRA North Central Division takes part in Brownsburg Holiday Parade
10 unforgettable alcohol racing moments from 2024
Evan Jonat named NHRA Senior Vice President of National Events
NHRA welcomes Clinton Snead as Director of Engineering
Tickets are now on sale for the 2025 Lucas Oil NHRA Winternationals
NHRA Expertise: The valvetrain secrets of a nitro-burning Hemi
The Hemi engines drag racers know and love get their name from the hemispherical (half of a sphere) combustion chamber that positions their valves 180 degrees from one another. Those monstrous valves are held in place by titanium retainers and steel keepers.
For Nitro Funny Car engines:
Only one cylinder-head design is acceptable: Intake valve angle of 35 degrees, + or - 1 degree Intake valve size maximum: 2.470 inches Exhaust valve angle of 21 degrees, + or - 1 degree Combined intake and exhaust valve size maximum: 4.395 Inches