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Username Post: Am I Crazy        (Topic#357855)
Posts: 71

Loc: Arizona
Reg: 03-13-09
08-28-19 07:27 PM - Post#2774360    

Last month I was bragging how I had nothing leaking under my 74 K-10. Took it out did a little 4 wheeling, my spare is a little to worn to 5 wheel. Came home on the freeway doing about 70 MPH for around 35 miles. Did a little more bragging as I pulled into the drive way about no leaks. I got out and oil had poured from the whole right side of the truck. I'm sure it came from blow by. over a qt.

I first ran a compression check and it was fine. I pulled the valve covers and made sure I had no restrictions in the oil passages. I rebuilt the 1990 350 a couple years ago and my emission readings are near zero. It hasn't done it since then but does anyone have a clue as to why it happened? My bragging?

Senior Chevytalk Moderator
Posts: 24975
Loc: Austin, TX 78748
Reg: 05-09-00
08-29-19 04:01 AM - Post#2774372    
    In response to badbob85037

Where did the oil come out? Check the intake rear. At steep angles, a small gap there will spill oil. Is the dipstick in place securely? Is the PVC valve working properly?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

"11th Year" Gold Supporting Member
Posts: 2098
Age: 69
Loc: south texas
Reg: 08-04-12
08-29-19 11:37 AM - Post#2774417    
    In response to badbob85037

motor oil, or ATF?


if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV

Posts: 1228

Loc: Mission,BC
Reg: 02-03-05
08-29-19 01:15 PM - Post#2774423    
    In response to beagrizzly

Is it gear oil from the front diff?
Where is the vent ran to?

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged

Whitetail Hunter 
"2nd Year" Platinum Supporting Member
Posts: 201
Whitetail Hunter
Age: 51
Loc: Green Bay Wisconsin
Reg: 03-28-15
08-30-19 07:09 PM - Post#2774534    
    In response to badbob85037

We're all crazy. It's not a competition....

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