409 hp for 63 - Impala Tech
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post #1 of 5 (permalink) Old 12-31-2005, 03:01 PM Thread Starter
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409 hp for 63

What was the hp for the 409 in 63?
BudW is offline  
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post #2 of 5 (permalink) Old 12-31-2005, 06:33 PM
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Location: Jackson, TN (soon to be Peoria, AZ)
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I have an engine data chart in one of my books that lists 3 different 409 engines for 1963. They are all 11.0:1 compression. The first is 340hp, and is the only one of the three that was mated to a powerglide trans. The second was 400hp, had a single 4 barrel carb, and only came with a manual trans. The third is 425hp, had dual 4 barrels, and only came with a manual trans as well. Hope that helps.

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post #3 of 5 (permalink) Old 01-01-2006, 02:39 PM Thread Starter
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Thanks For the help Just what i was looking for!

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post #4 of 5 (permalink) Old 01-02-2006, 12:13 PM
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Location: New to Virginia Beach
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My old "book of numbers" list 5 different suffex codes for 63 as followes:
QA- Man trans 4BC
QB- Man trans Dual 4BC
QC- Man trans
QG- Powerglide
QM- (RPO Z11)
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post #5 of 5 (permalink) Old 02-04-2006, 11:23 AM
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Compression on 409s in 63

I think the 340 horse 409 was 10:0-1 on compression. Only the HP were 11-1, and then only after removing one head gasket. They came from the factory with 2 gaskets per head, and about 10.2-1 compression. You removed one of the steel shim gaskets and had 11-1 compression. The 340 horse had a cast piston and was lower compression.

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