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Old 06-24-2004, 10:00 PM
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Pontiac 326-400

Hi Gang. I have just purchased a nice 67 LeMans with a 326 four barrel. I know the 326 was not exactly blessed with horsepower.
I am wondering if a pontiac 400 or 455 will bolt right in place of the old 326. The car is all original so I would like to keep it looking that way but have a bit of jam.
Also I was wondering about the 455 Olds. Are they the same engine from a different model car or what? Thanks a lot for any info you might have. John.

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Old 06-24-2004, 11:43 PM
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if you get a 400 or 455 from the same years, it will fit right in if you get a 73 or higher 400-455 the motor mounts will be different....there is a fix for it at nunzis.good luck
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Old 06-25-2004, 10:30 PM
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Any Pontiac engine from 350 to 455 will fit. They are all the same size externally as your 326. Older Pontiacs used two bolts to hold the mount to the block. Later ones used three, none of which were the first two. 455's have all 5 holes, 4 in a row at the bottom of the block, & one on a boss slightly above the line of 4. Some 400's also have 4 holes (or drillable bosses for them). They changed the diameter where the flywheel meets the crankshaft a couple of times, so get a flywheel that matches the new one.

Olds engines are totally different from Pontiacs. OK the lifters are the same, but that's about it.

Pontiac motor mount adapters (2-bolt to 3-bolt & vice-versa):

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