Engine Decking???
Thread Starter
Advanced
Joined: May 2010
Posts: 86
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From: Fort Thomas Kentucky
Engine Decking???
Can someone explain the term "engine decking" to me. I am looking at a Vette which has an engine that has been decked and the owner cannot tell me if it is numbers matching or not!?
Pro
Joined: Dec 2008
Posts: 531
Likes: 0
From: Frisco TX
thats my freshly decked 360ci above. Notice how the stamp pad is wiped clean.
The entire deck surface is trued by machining - it cleans up the head mating surface and allows you to tighten up quench. Removing material from the deck surface allows you to get the piston closer to 0 deck
My 360 above is .005 below 0
Racer
Joined: Aug 2006
Posts: 287
Likes: 0
From: N. Alabama
The engine has been rebuilt. To deck the block they basically shave the area the heads bolt to to make sure it is level. Sometime when they do this the numbers on the front pad of block can be shaved off. Would be hard to tell if it was the original motor if they were gone
Drifting
Joined: Jun 2010
Posts: 1,781
Likes: 15
From: Oxford Ohio
If they are gone it makes no difference if it's the original engine or not. It would never pass as a numbers matching.
Some shops can restamp the pad, they have a multi number stamp.
If the casting dates on the block, heads and build date of the car are with in reason, It may be, but the folks who are interested in numbers matching won't accept it in that condition.
Decking with a rotery broach a guy can deck and save the numbers. May have to finish it up with a vertical mill
Some shops can restamp the pad, they have a multi number stamp.
If the casting dates on the block, heads and build date of the car are with in reason, It may be, but the folks who are interested in numbers matching won't accept it in that condition.
Decking with a rotery broach a guy can deck and save the numbers. May have to finish it up with a vertical mill
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Race Director
Joined: Jul 2001
Posts: 15,892
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This takes the much abused and meaningless phrase to a new low level.
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Actually decking a block is done to keep detonation under control, but imo it's only worth the effort on higher CR engines with a thight cam, that run close to detonation or if you're aiming for a high CR on a small ci engine.
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
How many numbers need to match to be 'numbers matching'? Seems it's rarely all four...
Race Director
Joined: Jul 2001
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