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1/4" would prob. be enough.......you need to put the engine under a load (without running over anybody!!!) with the hood up to see how much the engine moves on the motor mounts.....I doubt that it will shift forward enough for the waterpump shaft to bump the E-fan.....
EDIT: copperhead.......I just woke up.......when did you "upgrade" your avatar?
< Its a pic of a 350 chebby without its valve covers...............(woof,woof)........Pretty!
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