Re: Average SB deck height and block decking questions
[Re: mshred]
#1142565
12/23/11 04:51 PM
12/23/11 04:51 PM
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Joined: Feb 2006
Posts: 1,051
The Great White North
RAMM
super stock
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super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
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How much do you think .005" really is? That is less than normal deck milling IMO. I have decked blocks .040" with no issues. Sounds like the shop is doing a good job. J.Rob
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Re: Average SB deck height and block decking questions
[Re: RAMM]
#1142566
12/23/11 05:01 PM
12/23/11 05:01 PM
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Joined: Apr 2009
Posts: 3,415
Toronto
mshred
OP
master
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OP
master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
How much do you think .005" really is? That is less than normal deck milling IMO. I have decked blocks .040" with no issues. Sounds like the shop is doing a good job. J.Rob
I know it's not a lot, I just wasn't sure what the norm was for taking material off these blocks...call me stupid, naive, extra cautious etc. but I just felt more comfortable to ask than ponder in my head.
That said, the shop is very reputable and they do some mopar stuff, but I figured I would ask the mopar crowd. Good to know that taking off about .017" isn't much then compared to what others have done
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Re: Average SB deck height and block decking questions
[Re: mshred]
#1142567
12/23/11 05:11 PM
12/23/11 05:11 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Its nothing to even remotely think about. Its normal and the shop will know what to do. .008 is a " normal" clean up, and even .020 is nothing anymore to make pistons zero deck.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Average SB deck height and block decking questions
[Re: CompWedgeEngines]
#1142568
12/23/11 07:04 PM
12/23/11 07:04 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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My block was cut .080 about 20 years ago. Absolutely no problems, but its a PITA when you need new pistons. Customs aren't cheap.
Yeah, it's got a smallblock.
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Re: Average SB deck height and block decking questions
[Re: 340B5]
#1142569
12/23/11 08:55 PM
12/23/11 08:55 PM
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Joined: Jan 2003
Posts: 6,139
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,139
Melbourne , Australia
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I have seem some blocks that varied by as much as 0.015" from front to back, I wouldn't lose sleep over it!
Alan Jones
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Re: Average SB deck height and block decking questions
[Re: LA360]
#1142570
12/23/11 09:10 PM
12/23/11 09:10 PM
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Joined: Feb 2007
Posts: 5,080
organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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i did a bb mopar a while back that not only had .010 slope (not unusual at all), but one end of one bank was OVER 10.725! heh. taking .020 or .025 off is totally normal to get zero deck. it all depends on your parts (and head gaskets).
for what is the good life if not doing things thoughtfully?
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Re: Average SB deck height and block decking questions
[Re: dusturbd340W5]
#1142575
12/23/11 11:09 PM
12/23/11 11:09 PM
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Joined: Oct 2006
Posts: 4,765
quick77rt
Parts Problem
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Parts Problem
Joined: Oct 2006
Posts: 4,765
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9.350 sounds way off, as delivered they are just a hair under an oem block deck height. Keep in mind just like many blocks produced there are some ducks that wont swim, ON the NOS X blocks I have if they dont have the org paperwork and its a shelf block, I pay them to have it sonic checked as well as a couple other things before buying them. Some are sorta like the w5 heads, hit and miss. This last one I took in I thought would have a high deck due the depth the head studs started but it was dead on and only .005 off end to end and was corrected. Quote:
Quote:
Quote:
my x-block was 9.350 
Holy Smokes! Before you did any cutting??
no that was finished product it was 9.358/9.360 when I got it and we squared it to 9.350
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Re: Average SB deck height and block decking questions
[Re: 5spdcuda]
#1142579
12/24/11 01:13 PM
12/24/11 01:13 PM
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Joined: Apr 2009
Posts: 3,415
Toronto
mshred
OP
master
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OP
master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Standard LA small block deck height is 9.56 so even your shortest side is 0.030 too high. At 9.56 the piston/rod combo you wish to use would have a positive deck height, ie. the piston would stick up out of the block assuming that the 9.583 # is correct for zero deck. In the FWIW dept. I personally don't care to go for absolute zero deck.I prefer to have the piston .005 in the hole. My reasoning goes like this: with a standard .039 thick gasket you will still have excellent quench and the compression loss is minimal. You will also have something to work with in case you have a head gasket failure that results in etching of the block surface. With a true zero deck any deck damage that may occur will not only require a clean up cut to the decks but you may well have to mill every piston top as well in order to maintain sufficient piston to head clearance.
well even if my block is higher than standard specs the piston/rod combo I chose is still shorter than what it currently is. I was actually thinking of getting the block milled to 9.585" and the deck height of the rotating assembly at 9.853" still so that I drop the compression ever so slightly and don't run any risk of detonation on the 94 octane pump gas here. Using a .039" gasket with good quench I have seen people say that 10.5:1 is acceptable with premium pump gas, but with how much im going to street drive I don't want to chance having to mix fuel.
thanks for this info btw! 
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