Description
True roller rockers with 7/16th stud a must. Deep exhaust tone with heavy chop. The largest lobe profile for a hydraulic 400-425 engine. Compression ratios of 10.8-11.2. Can be used with automatic or manual transmission. Suggested gear ratio with automatic 3.73 to 4.30. Suggested stall speed 2800 to 3500. Manual transmission gear ratio suggested 3.90-4.56. Aftermarket intake, headers, enhanced ignition system suggested. RPM 3800 to 6000
@.050 238 int.
@.050 246 exh.
Lobe separation 110
Int. Lift .540
Exh. Lift .535
suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
