Description
True roller rockers with 7/16th stud a must. Deep exhaust tone with heavy chop. Radical lobe profile for a hydraulic 400-425 engine. Compression ratios of 11.4-11.8. Can be used with automatic or manual transmission. Suggested gear ratio with automatic 3.73 to 4.30. Suggested stall speed 3000 to 3800. Manual transmission gear ratio suggested 3.90-4.56. Aftermarket intake, headers, enhanced ignition system suggested. RPM 3500 to 6000
@.050 242 int.
@.050 251 exh.
Lobe separation 110
Int. Lift .560
Exh. Lift .548
suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
