Next step for more HP (383BB)

Just an idea.....With about a .550 lift hydraulic roller.....Here's your 500 hp.

From Trick Flow's site.
PowerPort 240 Airflow Results
Lift Value Intake Flow CFM Exhaust Flow CFM
.100" 78 58
.200" 154 130
.300" 230 186
.400" 282 222
.500" 310 243
.600" 326 253
.700" 334 262
Tests conducted at 28" of water (pressure). Bore size: 4.350"; exhaust with 2" pipe.