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'59 Water Pump / Motor Mounts


Well-known member
Dec 24, 2003
Conway, SC
'59 Blk/Red, '71 Blk/Red
Hi All,

Hope you are all doing well with this Covid mess !

I just installed a new water pump on my '59 and have a question or two about the motor mount that is bolted through the water pump:
1) I mounted the water pump correctly passing the bolts through the pump and then the motor mount (gaskets on both sides. Then let the motor down onto the front mount; aligned the holes and then began tightening the m/m bolts. I am using a torque wrench but I seem to be compressing the rubber mounts quite a bit and I'm not even close to the torque spec of 25-35 lb/ft; I haven't even hit 20 lb/ft yet. How much should the rubber mounts compress ??

2) For some reason the bolts for the m/m that go through to rubber mounts at fine thread with castle nuts on the top for cotter pins. According to the Assembly Manual they are not the correct bolts; it doesn't bother me that they are not correct (a lot about the car is not NCRS correct), but will the fine threads affect my torque readings?

Thanks, and any help will be much appreciated,

Bernie O

Tom Bryant

Well-known member
Nov 9, 2000
Edgerton, Ohio, United States
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
The correct bolts have a spacer tube that the bolt passes through. The nut is torqued against the spacer. You won’t be able to get the mounts torqued without the spacer. Motor mount bolt kits are about $16.50 at Corvette Central and others.


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