Reply to "Engine Rebuild Questions"

George PAdmin.

The valve train of the 351 Boss engine had spring cups. Same iron heads. Less over the nose force, less lift than your engine. The idea is to stabilize the location of the spring where it mates with the head, to prevent it from squirming around, for a more stable valve train.

You'll need to fly-cut the spring seat area to accommodate the spring cup, and to make everything fit. Remember the installed height of the Crane spring is 0.020" less than the standard 351C installed height.

9/11/155:45 PM

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