# Ls1 guys crankcase pressure question

**URL:** <https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197>\
**Category:** NYSpeed Automotive\
**Created:** [August 13, 2008, 7:30pm UTC](https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197 "2008-08-13T19:30:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![9c1ny](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/9c1ny/32/5050_2.png) [@9c1ny](https://forums.speedlife.net/u/9c1ny)\
**Post date:** [August 13, 2008, 7:30pm UTC](https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197/1 "2008-08-13T19:30:38Z")

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I noticed the other day there was a light misting of oil on the underside of my hood on the passanger side and after looking around for awhile I couldnt find anything but the dipstick was pushed out maybe a half an inch…  
I had also recently deleted the AC lines so I guess its possible it could be from the cooling system back by the cowl but I doubt it, although the compressor did drip out a bunch of oily liquid when I removed it…  
I cleaned the hood off and pushed the stick down and have put about 100 miles on the car with several WOT runs to 100+ with no further problems

The engine has about 15k on it with Weiseco 3.905 pistons and  
CA Dura Moly Rings running 11.3.1 compression, would it help to add a breather in place of the oil cap?

I am guessing the increased compression is causing increased pressure mixed with the huge cam

Should I look into a catch can also?

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**Author:** ![brent\_strong](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/brent_strong/32/7203_2.png) [@brent\_strong](https://forums.speedlife.net/u/brent_strong)\
**Post date:** [August 13, 2008, 7:44pm UTC](https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197/2 "2008-08-13T19:44:35Z")

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I’d run a quick compression check…just 'cause.

Dipstick popped is not good.

Other than that, a catch can is very good to have. The LS6 PCV system might be worth looking into.

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**Author:** ![psychopjv](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/psychopjv/32/7251_2.png) [@psychopjv](https://forums.speedlife.net/u/psychopjv)\
**Post date:** [August 13, 2008, 7:45pm UTC](https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197/3 "2008-08-13T19:45:01Z")

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don’t ask me, HAHAHAHA!

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<div class="post-metadata">

**Author:** ![9c1ny](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/9c1ny/32/5050_2.png) [@9c1ny](https://forums.speedlife.net/u/9c1ny)\
**Post date:** [August 13, 2008, 9:01pm UTC](https://forums.speedlife.net/t/ls1-guys-crankcase-pressure-question/53197/4 "2008-08-13T21:01:17Z")

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> [@brent\_strong](#):
>
> I’d run a quick compression check…just 'cause.
> 
> Dipstick popped is not good.
> 
> Other than that, a catch can is very good to have. The LS6 PCV system might be worth looking into.

well its running fine, I dont even know if the dipstick was out or if it was just my imagination, it pushed down a tiny bit, I didnt notice any oil on the head of the dipstick or on the tube

upon look at the pcv set up its not stock at all, I was confusing it with my last ls1

one end goes into the manifold and the other end into the valley cover, so basically it is like a ls6 set up

I noticed the hose connecting the valve to the valley cover dosent fit the valve real snugly and there is a tiny amount of oil where it dosent fit well, I am going to look into getting a piece of hose that fits more tightly