Does anyone know the real horsepower figures for the LT1 engine? I have a 94 Camaro Z28 with a stock, 44,000 mile LT1, zero modifications to the car. I've seen the stock HP number stated as 275 HP, but both my father and I agree that the car is seriously underrated in horsepower. What is the real figure? Has anybody put the engine on a dyno or gotten a stock Z28 on a chassis dyno? I've only had the car a few months and haven't gotten the opportunity to do the test myself. What is the real story with the horsepower output of this engine?

 

LT1s arent really that underrated.

 

275 rated at the flywheel ends up 245-250rwhp

 

LT1=closely estimated hp
LS1=extremely underrated hp

 

well I think the LT1 is still slightly underrated. When you consider that it's rated at 275 hp, then take away the estimated 15-17% drivetrain loss, you would end up with a number in the 225-235 range at the rear wheels. I've never seen one dyno that low stock. I put down 246 rwhp myself stock.

The LS1 on the other hand is severely underrated. It's rated at 305-310 hp but puts almost that much power down at the rear wheels stock