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68 olds 455 BB in an 85 chevy Monte carlo

Old February 21st, 2018, 04:01 PM
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68 olds 455 BB in an 85 chevy Monte carlo

Help!! I have an 85 Chevy Monte Carlo that I'm dropping my 68 olds 455 into. Of course I ran into mounting issues. What mounts exactly do I need to make this work? I've read that olds 307 engine and frame mounts will work. Is this true? If you know a solution plz help, and post links to the right parts if you have them or pm me if you have them for sale. Thanks
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Old February 21st, 2018, 07:11 PM
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307 mounts, for the engine..
The 2004r that was most likely behind the 305 in the monte isn't going to like the power of that 455.
The th350/400 will need a different crossmember.
If you use the 2004r you'll need to get the tv cable brackets and set it correctly or the trans will be a goner sooner than normal.. and no the 305 ones will not work.

The 7.5" rear will break if you ever get the car to hook..
Good luck
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Old February 22nd, 2018, 06:28 AM
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The Monte is a Cutlass Supreme. Use the frame mounts from any 1977-1990 RWD B/C body or 1978-1988 A/G body with an Olds motor. Use Anchor P/N 2328 motor mounts. The frame mounts look like this. Note that they are RH/LH.



Also be aware that valve cover clearance to the HVAC box will be tight. Consider getting the Olds 307 valve covers, which are reshaped slightly and provide a little more clearance.
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