Here is an example of lower lift given duration 223-4 230 and higher lift same duration in big block mopar engine. More lift same duration same idle more power higher RPM.
224/230 "Chevy grind," and finished it off with a stock set of Mopar stamped steel rocker
arms and replacement tubular pushrods. The package is pretty basic as far as the cam and
valvetrain, fairly representative of a street performance setup with a "Chevy"-style lobe,
with lift specs of .465 intake/.480 exhaust.
440 cranked. We had 555 lbs.-ft. at 3,500 rpm, the bottom of our test range, and 510.2 hp
at 5,200 rpm.
Though power peaked at a relatively low 5,200 rpm, it kept pulling to our 6,000 rpm upper limit
with nary a drop-off in output. The idle quality with this cam was puppy-dog smooth,
pulling 14.5-inch Hg of vacuum at an 850 rpm idle.
Next, we made a quick swap to the identical Hughes 223/230 cam, which upped the lift at the
valve to .504 inch on the intake and .515-inch exhaust, for a gain of .039/.035-inch,
respectively. All the other cam specs remained the same.
Testing with the Hughes cam upped torque right from the bottom to 558.7 lbs.-ft. at 3,500 rpm
with the torque peak below the bottom rpm of our test. The torque increase was even greater
all the way to the top of the scale at 6,000 rpm. Peak horsepower was now 523.1 at 5,800 rpm, and though peak horsepower rpm was a good 600 rpm higher,
but the cam change definitively proved an advantage. Idle quality and vacuum was unchanged
from our baseline cam, so the bottom line was more output and more rpm with no apparent
Cam Velocity-Advantage Mopar - Mopar Muscle Magazine
A good example in an LT1 of short duration high lift not much cam advance is the LPE 211/219Cam
211 intake duration 219 exhaust 500"/.525" lift 1.5 rocker arms with 1.6's Lift I .533 / E.558 112lsa
This is an excellent sleeper cam for stock heads LT1 with 1.6 rocker arms 214/222 .533/.558 112LSA and it will put down
numbers as good or better than the Hotcam though it has less duration it has more lift with 1.6 rocker almost optimum for the stock Lt1 head flow.
My custom cam design should be able to pull 11's with excellent driveability. Try a custom regrind or new cam here are the specifications:
Cam lobe lift stock Lt1 Heads Intake .335 Exhaust .350
Lift at .050" 1.5 Rocker arms .502 Intake .525 Exhaust Duration at .050 Lift 221 Intake 227 Exhaust LSA/LCA 112 +6
Intake centerline 106deg
With 1.6 Rocker arms effective timing and lift 224deg .535" lift Intake and 230Deg .558" Exhaust. Stock LT1 heads.
Cam lobe lift ported Lt1 heads Intake .357 Exhaust .372
For Ported heads use the 1.6 ratio numbers above for the 1.5 ratio lift so the cam timing for ported Lt1 heads with
1.6 ratio rocker arms would be 227deg intake .568" Lift 233 deg exhaust .591" Lift Exhaust LSA/LCA 112+6 ICL 106 ECL 118
Max Power ported heads intake duration 233 deg exhaust duration 240 deg with 1.6 rockers and above lobe lifts
timing would be 236/243 .568/.591 114+2