Unlike most street racers, Troy's Camaro spends much of its time on the boulevard and hang
"I built this car to work on the street." That's how Troy LaCrone has always approached his '71 Camaro project. But this is no stoplight snoozer. Troy has his sights set firmly on running in the 8-second zone. It's a lofty goal cross-haired with Troy's laser-beam intensity. The small-block Camaro has already run a 9.61/137.60 with a 1.33 60-foot time at Gateway International Raceway on a conservative nitrous tune-up, and Troy is looking at a new converter and magic carburetor that promise to get him closer.
Unlike virtually all of Hollywood's lame attempts at car movies and those instant-gratification hot rod shows on TV where everything works perfectly every time, the road to street stardom is more often fraught with hidden land mines. Troy's Camaro started out as a 12.30s streeter with a stock crank 406 that eventually grenaded after running a series of low 11s. That pushed Troy to upgrade to more displacement while remaining true to his Mouse motor roots.
It's called spending your money where it will do the most good. Troy calls himself a Certified Master Black Belt Six Sigma instructor. We won't get into what that means. Suffice it to say, scientific method and a logical, studied approach to solving problems is what he does for a living. It should be no surprise that he followed that same path with the preparation and component purchases for the Camaro when he decided to pick up the e.t. pace. The trick here was that Troy spent time researching his purchases before he leaned on his credit card. That's where the AFR heads came from. They're the least-expensive version of the biggest 23-degree small-block head that AFR sells with no additional CNC porting. Matched to the heads is a one-off custom Lunati mechanical-roller camshaft that was born out of a discussion with cam master Harold Brookshire. But do not be misled.
It may not look impressive, and Troy prefers it that way. Even those small headers belie t
The AFR heads and 256/264-degrees-at-0.050 lobes have always been street-bound. That's why Troy liked Harold's suggestion of asymmetrical lobes with an aggressive opening flank on the cam and then a softer, smoother-closing ramp that would not abuse the valvesprings. "I'd rather change springs every five years rather than once a week," Troy says. The statement, "My entire car is a compromise," really sums up Troy's approach to this Camaro. This is why the 434ci Mouse isn't a 12.0:1 or 13.0:1 effort--pump gas will always be much cheaper than race gas. It also didn't make economic sense to build all the power with the motor when nitrous is such a quick and easy horsepower lever. He also didn't go right out and hammer the biggest jets into the NOS system. Instead he built his power pyramid more gradually, eventually working up to the current 225hp combo. The next step is even more power with a 350hp shot. But before that happens, he's currently testing a new, tighter Yank Racing torque converter for the Turbo 400, since the 225 shot eventually loosened up the old converter where he was spinning close to 8,000 rpm going through the lights even though the Camaro only twists a 3.89 gear with 28-inch-tall rear tires.
The compromise extends to the Camaro's suspension as well. While you might expect more race-oriented components between the rear wheelwells, it's shocking to see stock Camaro leaf springs, an inexpensive set of slapper traction bars, and a set of Competition Engineering adjustable shocks. But look closely because there is still plenty of science in these mundane parts. There's a wedge between the springs and the rear axlehousing that dials in a 512-degree nose-down pinion angle. And despite the lack of solid-spring-eye bushings, Troy reports no wheelhop problems.The 3.89-geared 9-inch Moser rear is a relative newcomer to the car. That's because the original 12-bolt broke spectacularly just a few months ago.
Troy's starting-line video shows how the aluminum T/A rear cover disappears when both axletubes, which had been fully welded into the centersection, broke, snapping the driveshaft and shoving the pinion snout (still connected to the rearend) through the floor and ripping the backseat upholstery. That's when you know you're hooked up. All of these compromises are in an effort to keep this a streetable car. The torque converter, leaf springs, and pump-gas-friendly compression limit the car's ultimate dragstrip e.t. and speed but pay off in terms of fun-behind-the-wheel time. We went for a check-out ride with Troy, and when you've got a 9-second car that will idle in neutral at 1,000 rpm with an idle vacuum of 9.5 inches even with a monster 256 at 0.050 camshaft, that's not much of a compromise. Even Troy was shocked when he measured it. The ride is almost living-room comfortable, but understand that's with soft shocks, no front sway bar, and not-for-highway-use slicks at 20 psi--certainly deceiving for a pavement pounder. The converter is tight, in fact it pulls at part-throttle almost like a stock converter.
Still, the lure is there to run an 8 in full street trim except for the slicks. Troy believes it can happen, and that's half the battle.
Troy's '71 Camaro Quarter-Mile HistoryE.T./Speed 60-Foot Description*1
2.33/107.00 1.730 Previous-owner best, 406,
Lunati cam11.69/114.42 1.619 Lots of tuning, 28x10.5
slicks11.479/115.39 1.564 Remove front sway bar, better
air11.366/118.13 1.681 Short-shifted 6,400
versus 6,80010.894/122.66 1.599 New 434ci motor, same
converter10.766/125.32 1.531 New Yank converter and
rebuilt trans10.125/132.02 1.458 NOS 210hp shot, ran rich9.94/132.61
1.353 150hp tune-up, NOS Cheater plate1
0.618/126.05 1.507 Best on-motor pass9.610/137.60 1.337 225 NOS shot,
best pass to date*All this occurred between 2001 and
May of 2005.
ImprovementsE.T.: 2.72 secondsMPH: 30.60 mph60-FT: 0.393 second
1. One advantage to a streetable car is that quickie tests on new ideas or equipment can o
2. Troy not only builds his own engines but also does his own painting and bodywork. The C
3. A high-tech analytical approach with low-buck solutions is what Troy lives for. Those a
4. This is a three-ring binder full of Car Craft and other magazine stories that Troy has
5. Troy uses the two separate fuel system approach for the engine and nitrous systems. Two
6. This is part of the stock 406 crank that ventilated his oil pan just driving down the s
What: '71 Chevrolet Camaro
Owner: Troy LaCrone, who also has a bitchin' Web site, enginecombination.com.
Hometown: St. Clair, Missouri, one of those little towns that has two exits off Interstate 44, just in case you miss the first one.
Techs: Troy is not shy about asking for help and is also willing to acknowledge guys like Tom Oermann at Meramec Automatics, Yank Racing, 10.5 tire racer Scott Lowery, Alan Casey, Tom Monehan, Brian Raymond, Roy Parmer, Mark Workman, J.T. Flora, Jason Sheets, and Patrick Meyers, along with his wife Tonya and his dad Mike.
Short-block: Motown iron block with an Ohio Crank 4340-steel forging and JE 10.6:1 forged pistons and Total Seal conventional rings.
Camshaft: Lunati RA1 mechanical-roller cam with 256/264 degrees of duration at 0.050-inch tappet lift and 0.624-inch valve lift for both.
Heads: Airflow Research 227cc partially CNC-ported heads with 2.10/1.60-inch stainless steel valves and Harland Sharp 0.050-offset intake rockers.
Induction: Edelbrock Super Victor with an 850-cfm Holley carb, but Troy is currently switching over to a Pro Systems 1,050-cfm carb based on a standard flange Holley.
Nitrous: Nitrous Oxide Systems Big Shot plate system with a current 225hp tune-up. Troy will now try a 350hp shot to get into the 8s. He also mixes race fuel in with the pump gas when he runs the big nitrous tune-up.
Fuel System: The plumbing is actually two separate systems, one Holley "black" 140 pump for both the engine and the nitrous system with a combination of Holley and Aeromotive regulators originating from a 12-gallon fuel cell in the trunk.
Headers: Troy and his friend Tom Monehan modified Hedman 134-inch headers.
Drivetrain: Meramac Automatics built the TH400 trans with a TCI reverse-manual valvebody controlled by a B&M MegaShifter.
Troy has just installed a new Yank Racing 9.5-inch nitrous converter that is much tighter with a 4,500-rpm on-nitrous stall speed intended to be used with the bigger 350hp shot. Driveshafts Unlimited supplied the steel driveshaft while there is now a Moser 9-inch with 3.89:1 gears and 35-spline Moser axles to take the abuse from the big nitrous loads.
Suspension: Don't look for ladder bars or coilover shocks on this 9-second beast, yet Troy can pull off a 1.33 60-foot time with stock leaf springs, Lakewood bolt-on traction bars, and adjustable Competition Engineering adjustable shocks. The chrome-moly 10-point 'cage helps tie the car together. For tires, Troy depends on a set of 28x11.5-15 M/T E.T. Drag slicks mounted on 15x10 Center Line Convo Pro wheels with skinnies up front.
Body and Paint: Along with his tuning prowess, Troy also does his own bodywork and paint with help from friends. The entire car is sprayed in pearl blue with white stripes that Wally Edlers helped apply. END