How so?

 

Because I took my roller rockers off because people seem to have the incorrect theory that they cost horsepower. The first time the car was dynoed was in June when it only had 100 miles on it. It made 386 at the wheels. After everyone pointing fingers at the roller rockers causing the power loss, I swapped them for a set of stock rockers with trunion upgrades. In much better weather with a motor that is now broken in with 700 miles on it, I made 388. Obviously the Scorpion rockers weren't costing me that 40 HP that some were claiming...LOL

Frank

 

Something is just not right. You should be well into the 400's. Any chance the trans is slipping?

Have not really had any experience with OBX exhaust components?

Try a leak down on the engine?

Confirm the tune accuracy?

Hope it works out for you. Nothing more frustrating then when a combo just doesn't work.

 

I'd ixnay those cats as the low mph screams that they are clogged from running the nine degrees of overlap camshaft. Last fella I remember to have that camshaft in a stalled Corvette said his valve train was just plain unstable above 5500. The lobes need crazy springs, factory rockers help, hollow valves and titanium retainers help, but then the push rods weren't stiff enough and then the lifters couldn't handle the pressures either.
Sure gears or a bit more stall might help some but IMO, you're cats gone and a Tooley stage one camshaft from running 11.70s at 118 mph.

 

The trans is definitely not the issue.

I'm wondering about the flow of the OBX cats and exhaust as well.

It's had the tune checked.

SAE is 388. Corrected is 398

Frank

 

Tony,
Did you see the dyno graph? Is that why I have such a choppy reading above 5500?

Frank

 

Its in the 1/8th mile time. 7.90 is pretty slow. Better 60ft and 7.60 -70 in the 1/8th will get it in the 11s.