Edelbrock Performer-Link Double Roller Timing Chain Set - Keyway Adjustable - AMC V8 B2 Helmets Maybe the throttle shafts are

Maybe the throttle shafts are worn or a screw has become cross threaded

XXX Sprint Car bird cage

of torque when used with #2176 intake and stock iron cylinder heads on a 318 engine

Borgeson Conversion Box

Drilled for 1/2" studs

Edelbrock Performer-Link Double Roller Timing Chain Set - Keyway Adjustable - AMC V8 B2 Helmets Maybe the throttle shafts arePerformer Link timing chain sets are for use with Edelbrock or stock cams. They have a solid bushing chain for a true bearing surface that rolls with the sprockets, eliminating chain stretch. Edelbrock, Timing Chain, Performer Link, Chain, Gear, Engine, Short block, Long Block, Rebuild, Cam swap, 7818 Be sure that both cam and crank sprockets are exactly in line with each other Misalignment can cause chain to break Make sure that the chain clears oil