Look what Mark did for this intake plenum. By cleaning up rough edges and irregular passag
For our Budget 347, Mark port-matched the intake manifold and cylinder heads to achieve smooth airflow. This is one of the single greatest steps you can take when building a street driver small-block. Port matching and cleaning up the runners yields abundant airflow, as proven by our chart. Mark achieved a whopping 26.45 percent and 81.7 cfm on his best runner with port work. He also cleaned up the plenum, which improved flow.
Port matching doesn't take much effort. All you have to do is get intake ports, runners, a
The Edelbrock Victor Jr. cylinder head for 351W-based engines can also be installed on the
These larger 70cc high-swirl combustion chambers are important to consider when choosing c
With 1.7:1 Comp Cams Magnum roller rockers and the Parker manifold, we gained 7.3 hp and l
What Is Rocker-Arm Ratio?
There are two kinds of lift-lobe lift and valve lift. Lobe lift is maximum lift or rise at the cam lobe. For example, if lift is 0.450-inch lobe lift, the lobe itself gives us 0.450-inch (nearly 1/2-inch). Valve lift is what the cam lobe and rocker arm combined give us via the pushrod. If we're running a 0.450-inch lift cam with a 1.6:1 rocker arm, we're getting 0.720-inch or nearly 3/4-inch. Rocker ratio-1.6:1-takes 0.450-inch cam lobe lift and multiplies it 1.6 times. When stepping up to a 1.7:1 rocker ratio, we're taking cam lobe lift and multiplying it 1.7 times.
Edelbrock Performer RPM Air Gap intake manifold, 830-cfm Holley 4150, and 1.6:1 Trick Flow Specialties rocker arms
Switch to 1.7:1 Comp Cams Magnum rocker arms with Edelbrock Performer RPM Air Gap intake and 830-cfm Holley 4150
Parker single-plane, long-runner intake manifold, 830-cfm Holley 4150, and 1.6:1 TFS rocker arms
Parker intake manifold w/1.7:1 Comp Cams Magnum rocker arms