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#1
04-10-2021, 03:52 PM
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62 motor mounts
I have know I have two options for motor mounts stock and Butler Solid and I know the difference.
Question is this I have a built 421 that is a stump puller.. 490hp and 530 ft lbs if trq, behind it is a 4 speed.. So question is solid or stock.. |
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#2
04-10-2021, 03:56 PM
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What car is it in? How much does it weigh? And what are you going to do with it? Street or street occasional strip, I would go with stock. If lots of strip time in the future, solid.
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If you built it, drive it. red 62 Tempest total stock restoration. white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train. |
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#3
04-10-2021, 04:11 PM
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62 Pontiac Catalina
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#4
04-10-2021, 05:29 PM
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Quote:
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#5
04-10-2021, 05:35 PM
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The torque and the 4 speed is not a full on problem until you hook up real well or if you will be dumping the clutch at 5k rpm.
None the less I would do a search here to see what others have done when using stock type mounts to limit engine roll over.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
04-10-2021, 06:45 PM
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Thanks
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#7
04-11-2021, 10:41 AM
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use a short piece of chain or i make a piece of tubing with rod ends on each end for a torque limiter
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
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#8
04-11-2021, 11:57 AM
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Anyone that is contemplating solid motor mounts needs to look at a picture of a Pontiac block upside down to see that the 2 bolt motor mount location transmits all the twisting force to only one of the main bulkheads, #3. By looking at the early 2 bolt mount location, and the added strength of the later 3 bolt mount system it's obvious why Pontiac engineers redesigned the mounting system for higher torque applications with the advent of the 455 in 1970.
It's been determined in some instances to cause the failure of the cast iron on this location on stock blocks. Pontiac redesigned their mount system on the latter 455 applications to 3 mounting points and using #2 and #3 bulkheads for superior strength. I personally have used a engine restraint system since the mid 70s, consisting of a turn buckle attached to the left cylinder head and the frame, and still use the OEM mounts successfully in conjunction with the restraining link. This completely removes the stress to only the #3 main bulkhead area. It makes me sleep better at night with the improved system of restraining the engine. 
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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