Hydraulic flat tappet
Basic Operating RPM Range 1,500-5,500
Intake Duration at 050 inch Lift 214
Exhaust Duration at 050 inch Lift 224
Duration at 050 inch Lift 214 int./224 exh.
Advertised Intake Duration 280
Advertised Exhaust Duration 290
Advertised Duration 280 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.443 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.465 in.
Valve Lift with Factory Rocker Arm Ratio 0.443 int./0.465 exh.
Lobe Separation (degrees) 112
It's not a huge cam, he's using a roller cam with 660 lift so there's a big diff. I'm not sure on the head size, probably 210, I remember him mentioning that. I guess they were used on a bracket racer. I can always go to a bigger cam if I have to, I just can't get above 6000 rpm because I have a stock bottom end. These heads are comming off a sbc 350 with basically the same bottom end (except he used a 2 bolt, he just never revved it over 6k).