Description
Excellent choice for a modified 400 engine. Heavy chop. Deep exhaust tone. Nice lope. Stall speed of 2400 suggested. Dual plane intake such as Edelbrock Performer, OLB4. For single plane intake manifolds such as Holley Street Dominator, Torker or Port O Sonic will show increases in torque and hp throughout the entire rpm range. Roller tip rocker arms or true roller rockers. Aftermarket ignition will enhance horsepower and torque output. Headers will enhance engines torque output as suggested. Compression ratio 9.8-10.2. Works well with automatic transmission or manual. Gear ratio suggestion for automatic 3.42 to 3.73. Manual transmission 3.55 to 3.90
@.050 231 int.
@.050 238 exh.
Lobe separation 110
Int. Lift .515
Exh. Lift .490
Suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
