Valve springs 340 Stocker Engine

[James L Miller]

Originally Posted by Mike Coe

Thanks for the replies.. Turbo, the reason the 1409X won't work is, the inside diameter of the spring is too small, I need at least 1.00 inch and when you squeeze that spring down to 1.680 installed height and then collapse it down .520 for cam lift and coil bind clearance it is at 1.16 and it says it coil binds at 1.19 inches. Mike

Sorry if I am ignorant on Stocker engine builds, but the spec I have for a 1969 340 calls for a .462" intake and .473" exhaust lift. Are people using a "square" lobe to loft the valvetrain off the lobe to get the .520" lift? I have an old Cam Dynamics 340 Stocker cam from the 1970s and it has a flattened nose on the lobes. I have some newer cams from Lunati and Bullet that have a more regular lobe appearance.