10/09/2026
Awesome to see LSX Magazine share our LT4 Camshaft testing! Gabriel Griffin
Nobody had run a controlled, back to back camshaft comparison on the supercharged Gen V LT4, so Flag Motorsports and Griffin Motorsports went and did it themselves.
Seven cams including the factory grind as the baseline, more than 80 dyno pulls, five days of twelve plus hours at Westech Performance, in 105 degree heat.
Before any cam swapping happened, they built the engine the way most LT4 owners actually build one. Baseline first, then the biggest cam of the test dropped into an otherwise stock long block, which was worth 76 horsepower and took boost from 12.2 psi down to 8.7. Then a larger overdrive pulley, good for 29 horsepower but it handed back the rpm the cam had just found. Then Flag’s ported heads, worth 100.3 horsepower and 500 more rpm with the heads as the only change. Then the Kong X-Port blower, which was the single biggest gain in the entire test at 161 horsepower and pushed the combo past 1,000.
All six cam swaps were then run in one calendar day to keep conditions consistent. The BTR development cam made 950 on stock valve springs. BTR’s new Stage 1 V3 made 981 with the flattest torque curve of the group. Summit’s shelf grind made 983 but noses over past 6,500. The Apex cam from Late Model Performance was the first one to pull clean to 7,000. The $100 Facebook Marketplace cam they nicknamed the Zucker still cleared 1,000.
Peak horsepower went to the Rick Crawford cam at 1,006, and it did it on the lowest boost of any cam tested, which tells you how little that combination was fighting itself.
They also hung a 3.0L Whipple on it at the end just to see. Over 100 horsepower more at roughly half the blower speed, with charge temps down 40 degrees.
Which cam would you be running in your LT4?
