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400 block in my 68?

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Old Jan 7, 2009 | 04:53 PM
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GeorgeS's Avatar
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Default 400 block in my 68?
I have a 68 with the original 327 / TH400.. If I were to replace the engine with a 406 (and put the 327 on a stand) how nicely would it fit? Anything in the way? Mounts fit? Is the 400 block heavier? Suspension issues...
Thanks for the help
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Old Jan 7, 2009 | 06:38 PM
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Small Block Chevy = Small Block Chevy

Everything should bolt up just fine. Just expect that a 406 will put a bigger stress on your cooling system and driveline so make sure those are all up to par.
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Old Jan 7, 2009 | 06:41 PM
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Externally the small blocks are dimensionally identical.
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Old Jan 7, 2009 | 07:34 PM
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That should be a nice combination for a powertrain, and the THM400 is plenty beefy for the power of a 406.
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Old Jan 7, 2009 | 10:27 PM
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I have a 400 bored and stroked to 434
Can't tell it from the outside at all.

But you can sure tell when the green light comes on!
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Old Jan 7, 2009 | 11:53 PM
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The 400 Block has bigger Bores so less metal so the Block weighs less than a 327. Though not enough to make any diffrence in a street car.
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Old Jan 9, 2009 | 12:06 AM
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Bolts right in. 400 balancers are large and can interfere with power steering. But not an impossible problem.
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