The following special custom cams have been dynoed and the proven horsepower/torque numbers are listed. All require an adjustable valve train.
[email protected] [email protected] Gross/Lift Lobe/Sep
253/256 281/289 .730/.704 107/107
This mechanical roller cam in a 461 cu in 455 Olds engine with DMR ported aluminum heads made 577.6 horsepower @ 6000 RPM and 579.7 torque @ 4800 RPM using 12:1 compression on 110 octane pump gas. Needs ported heads that flow in the 360 CFM range. Excellent for bracket racing. Needs a 4000+ converter, intake, headers and 4.10+ gears. Very rough idle.