I've been playing with this 406 SBC for about 30 years now. 69 041X heads with the "Crane medium springs" in the stock spring pockets. 2.02 / 1.60 valves. It's a riot!

Mild camshaft. Hydraulic 214/218 at .050, .456 / .458 lift.

How often do you change the ... Login to read more.