Deck Height Variation
11-20-2006, 08:08 AM
#1
Deck Height Variation I’ve been working deck heights on my motor and they do have quite a bit of variation. Knowing a lot of you have changed head gaskets to tighten quench and assuming you checked all of the deck heights,,,,, what kind of variation did you see? How did you then determine target gasket/quench?
Thanks!
Thanks!
11-20-2006, 08:16 AM
#2
TECH Senior Member
Awsome ride man 
You measure all, pick the highest out and base your calcs on that one. But it shouldn't be that far apart if you have correct TDC on that piston, and for that you need a dial.
You measure all, pick the highest out and base your calcs on that one. But it shouldn't be that far apart if you have correct TDC on that piston, and for that you need a dial.
11-20-2006, 09:56 AM
#5
This is a rebuilt shortblock and yes it was decked,,,, although it appears not very well on the driver side (.-18 to -.022). Gaskets,,,, well that's the question. I have a set of .060 Cometic's here as well as a set of the GM MLS's for 02+ LS1 (.060 also I beleive). I got the GM's to verify PR length.
Don't know exactly what to do. On driver side with the deck at .019, .020, .021 and .022 the .060 gaskets seem OK with a .038 quench. On the passenger side, with the deck at .016-.017 for all holes,,, I'm looking at a .043 quench.
Am I worring too much?? or run different gaskets side to side???
Don't know exactly what to do. On driver side with the deck at .019, .020, .021 and .022 the .060 gaskets seem OK with a .038 quench. On the passenger side, with the deck at .016-.017 for all holes,,, I'm looking at a .043 quench.
Am I worring too much?? or run different gaskets side to side???
11-20-2006, 10:50 AM
#6
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Originally Posted by gtpvette
This is a rebuilt shortblock and yes it was decked,,,, although it appears not very well on the driver side (.-18 to -.022). Gaskets,,,, well that's the question. I have a set of .060 Cometic's here as well as a set of the GM MLS's for 02+ LS1 (.060 also I beleive). I got the GM's to verify PR length.
Don't know exactly what to do. On driver side with the deck at .019, .020, .021 and .022 the .060 gaskets seem OK with a .038 quench. On the passenger side, with the deck at .016-.017 for all holes,,, I'm looking at a .043 quench.
Am I worring too much?? or run different gaskets side to side???
Don't know exactly what to do. On driver side with the deck at .019, .020, .021 and .022 the .060 gaskets seem OK with a .038 quench. On the passenger side, with the deck at .016-.017 for all holes,,, I'm looking at a .043 quench.
Am I worring too much?? or run different gaskets side to side???
What's the part # do you have on the GM MLS gaskets?
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11-20-2006, 11:51 AM
#8
TECH Senior Member
With the ascending numbers as you portray them, it seems to me that the deck was not done flat. more like less in front of block and more in back (or vice versa).
You might want to verify that and you might have to redeck the block flat.
This will become noticeable with intake allignement and port matching and might be even be an issue with gasket sealing such as Cometics.
Mine were within .000x of each other.
You might want to verify that and you might have to redeck the block flat.
This will become noticeable with intake allignement and port matching and might be even be an issue with gasket sealing such as Cometics.
Mine were within .000x of each other.
11-20-2006, 05:44 PM
#9
Predator-Z
Thanks again for your thoughts. You are right about the decks,,, they are not flat on the dirver side,, at least in reference to the crank. In honesty,,, I don’t want to throw more good money at this motor. I’ve spent way too much already and needless to say I made a poor choice in the machine shop I went to (there should be a sticky about this!!). At this point I just want the best I can get on this short block and get my car going. If this motor goes,,,, I’ll start over with short block from a vendor.
All that said,,, what do you think,,,, just go with the .060’s and call it good?
Thanks!
Thanks again for your thoughts. You are right about the decks,,, they are not flat on the dirver side,, at least in reference to the crank. In honesty,,, I don’t want to throw more good money at this motor. I’ve spent way too much already and needless to say I made a poor choice in the machine shop I went to (there should be a sticky about this!!). At this point I just want the best I can get on this short block and get my car going. If this motor goes,,,, I’ll start over with short block from a vendor.
All that said,,, what do you think,,,, just go with the .060’s and call it good?
Thanks!
