Description
Modified 403 applications whereas a true roller rocker is mandatory. 7/16th screw in rocker studs a must. Deep exhaust tone. Moderate chop in exhaust. Compression ratios of 9.6 to 10.0. Aftermarket intake manifold , Holley 750 or 950 cfm carb. Enhanced ignition, Headers, True dual exhaust, 2400 min. stall speed converter for automatic transmission. Recommended gear ratio for automatic 3.73 to 4.10. Manual transmission 3.90 to 4.10 gear ratios. RPM range 2800 to 6500.
@.050 228 int.
@.050 234 exh.
Lobe separation 108
Lift Int. .560
Lift exh. 548
suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
