Description
Great choice for an enhanced 403 rebuild restoration. Great driveability. Deep exhaust tone. Moderate chop. Works well with the factory rocker arms. Compression ratios of 9.2 to 9.4. Enhanced ignition suggested but not a must. Works well with 3.23 gear ratio and works even better with 3.42. Works fine with factory exhaust manifolds. Headers will give improved torque output and increased HP. For automatic and manual transmission. RPM range 1800-5200. Tip: Due remember that these Trans Ams are not light, and are underpowered when comparing weight and factory HP. Increasing numerical gear ratios to a 3.42 or even a 3.73 will really help performance.
@.050 226 int.
@.050 231 exh.
Lobe separation 108
Lift Int. .480
Lift exh. 480
suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
