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Keith Seymore's 1974 Chevy Chevelle - Two Tons Of Fun

This 10-Second '74 Chevelle Proves There's More To Going Fast Than Being Lightweight.

By Cole Quinnell, Photography by Robert McGaffin

Keith's racing affair with this '74 Chevelle was incremental for many years. In the mid '90s, he was playing around with the rear suspension and the attachment points in particular. He drilled some extra holes for upper control arm mounts and ended up breaking the frame. At that point, he and his dad-who worked with him on the car throughout-decided that they needed to take the body off the frame. They ended up narrowing the rear framerails of the car 11/4 inches on each side and re-engineering the suspension mounts. To narrow the framerails, the rear crossmember was sectioned and the factory rails were simply moved closer together. That change allowed him to fit a 131/2-inch tire on a 10-inch wheel without modifying the factory wheel tubs. The new locations for the trailing arms allowed Keith to achieve a better instant center, delivering race-car four-link geometry with factory parts.

The only question at this point is, what's next? Keith has had quite a bit of success in the NMCA racing series, racking up wins from 2001 to 2008. He's thinking he might have a good recipe to compete in the Factory Appearing Stock Tire (F.A.S.T.) racing series. Just like any good relationship, time is well spent embarking on the next step in the adventure.

'74 Chevy Chevelle
Keith Seymore • Troy, MI
Total cost to build: $15,000

Engine
Type: Chevy 555 big-block
Block: GM Performance Parts Bow Tie short-deck CNC
Oiling: Moroso wet sump
Rotating assembly: K1 Technologies 4.250-inch forged crank and H-beam rods; forged 13:1 Weisco pistons
Cylinder heads: AFR CNC aluminum castings with 118cc chambers and 2.30/1.88-inch valves
Camshaft: Cam Motion 284/297 at 0.050, 0.798/0.764-inch lift
Valvetrain: COMP Cams stainless 1.7:1 rockers; PSE springs, COMP Cams retainers and pushrods
Induction: Dart 4500-series intake manifold ported by CFE, Holley 950-cfm for NMCA racing, and 1050 Dominator for bracket racing
Exhaust: Modified Hooker 2 1/4-inch headers with 4-inch collectors, dual 4-inch Flowmaster mufflers
Power adder: none
Fuel system: Holley mechanical fuel pump at the engine, Holley electric pump at the tank
Ignition: MSD 6AL, distributor, coil, and plug wires
Cooling: Two-core replacement radiator, mechanical fan, aluminum water pump
Output: (estimated) 900 hp at 7,000 rpm and 900 lb-ft at 4,500 rpm
Built by: Scott Williams at S&K Racing

Drivetrain
Transmission: GM TH400 auto with full-manual valvebody built by Jim Paquet of JPT, Coan 9-inch 4,000-stall converter, factory console shifter
Rear axle: stock 8.5-inch 10-bolt rearend housing with 4.10:1 gears, Mark Williams axles, C-clip eliminator kit and spool

Chassis
Front suspension: factory control arms, 90/10 drag shocks, travel limiters
Rear suspension: station wagon passenger-side leaf spring, stock shocks, driver-side spring, and boxed factory control arms
Brakes: factory front disc and rear drum brakes

Wheels & Tires
Wheels: Corvette Rally wheels 15x6, front; 15x10, rear for street (15x8 for racing)
Tires: 235/70R15 Firestone, front; Mickey Thompson 29.5x13.5x15 ET Street (29.5x10.50x15 slick for racing), rear

By Cole Quinnell
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