Description
Great choice for an highly modified 403. Deep exhaust tone. Heavy chop in exhaust. Works well with the factory rocker arms, roller tip rockers or true roller rocker arms. Compression ratios of 9.7 to 10.0. Aftermarket intake manifold, Holley 750 or 950 cfm carb. Enhanced ignition suggested. Works well with 3.42 to 3.90 gear ratios. Headers, True dual exhaust, 2400 stall speed converter for automatic transmission. Manual transmission 3.73 to 4.10 gear ratios. RPM range 2800-6200
@.050 228 int.
@.050 234 exh.
Lobe separation 109
Lift Int. .495
Lift exh. 480
suggested lifters https://oldsperformanceproducts.com/product/lifters-hydraulic/
