Decked - Team Camaro Tech
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post #1 of 4 (permalink) Old Mar 30th, 04, 07:42 AM Thread Starter
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What does the term 'Decked' mean. The engine or heads have been or never have been decked as an example.

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post #2 of 4 (permalink) Old Mar 30th, 04, 08:10 AM
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"Decking" is the term for machining the surfaces of a block or heads.
"Decked" means the surfaces HAVE been machined, a "Non-decked"(or "never decked") block/heads would mean they have NOT been machined.
Ideally this should be done so the deck of the block is exactly 90 degrees to the center of the crank and each other. AND, so both surfaces are equal distances from the crank centerline.
Decking the heads is normally done in the same plane as the original factory machining, but they can also be cut at different angles to effect compustion chamber size and compression.
Any good machine shop should be able to give you a tour of their facilities (if you are thinking about having work done by them) and explain how/why they machine parts.

ps: FYI - Engines using Decked Blocks and Heads often require additional machining of the Intake to allow for the material removed during 'Decking'.

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post #3 of 4 (permalink) Old Mar 30th, 04, 08:19 AM
 
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Decking refer's to machining the flat surfaces of both the head and the block to make sure they are flat.

Heads are decked to make sure they are straight and level as well as to set a specific combustion chamber volume..

Blocks are decked to make sure that the correct as spec'ed or wanted piston location is right in the block.

Like if you want a quench distance for your particular engine of say .045" and your pistons are down in the hole .035", you can machine off the decks say, .012" which will put the piston .023" down in the hole and then use .022" thick steel shim headgaskets to arrive at .045" clearance...

Also decking a block is done to make sure it is square end to end and side to side so all corner measurements are the same with respect to a given quench distance..

Hope this helps and I hope my Math is right so I don't confuse you??

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post #4 of 4 (permalink) Old Mar 30th, 04, 09:03 AM
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All those reasons for decking a block are for performance reasons.
There's one reason for decking that is not so performance oriented. Some guys deck a block to remove the numbers on the engine pad. Then they stamp a "better" set of numbers. One thing to look for on decked/restamped blocks is the braoch marks. Assembly line deck machining used a tool sort of like a reel type lawn mower, that left machine "scratches" running from back to front.
Most machine shop machining leaves swirl marks.

It's hard to duplicate the factory broach marks.
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