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04-04-2009, 09:18 PM
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#1 |
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OurLadyofBlessedAccelerat ion
Join Date: Aug 2007
Location: Denver, CO
Posts: 148
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Are these holes bad?
Took the valve covers off of my 396 for the first time today to attempt a valve adjustment. To my surprise I noticed some rather large holes next to half of the push rods (all on the intake side). The holes were all on the (lookers) left of the #1, #5, #4, and #8 intake valves.
the motor has been running, albeit rough, so I am not sure when/how these happened. How are these caused? Are they catastrophic? Is this considered normal? What should my course of action be at this point?  !!!Thanks!
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_______________________________________________ 1968 Chevy C-20 w/ 396  1997 HD Sportster 1200 street tracker 1994 Chevy 1500 Silverado 
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04-04-2009, 09:24 PM
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#2 |
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Nothing to see here.....
 
Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: Are these holes bad?
looks like a casting porosity? just a guess.
I am no expert and I didn't spend the night at a Comfort Hotel.
__________________
Doug THANK YOU to our American Soldiers & Veterans - POW MIA "You will NEVER be forgotten". The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson |
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04-04-2009, 09:47 PM
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#3 |
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Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: Are these holes bad?
looks like your normal oil return holes to me
__________________
1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles  18.5" x 31" Hoosier Pro Street Radials  ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree 
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04-04-2009, 10:04 PM
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#4 |
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OurLadyofBlessedAccelerat ion
Join Date: Aug 2007
Location: Denver, CO
Posts: 148
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Re: Are these holes bad?
That would be great.
the jagged edges aren't a concern?
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_______________________________________________ 1968 Chevy C-20 w/ 396 1997 HD Sportster 1200 street tracker 1994 Chevy 1500 Silverado
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04-04-2009, 10:09 PM
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#5 |
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Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: Are these holes bad?
Wow, yeah, those can't be fixed! I would take that engine out and ship it to me at your expense! JK/
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-Scott- |
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04-04-2009, 10:57 PM
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#6 |
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Senior Member
Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: Are these holes bad?
Thats just normal casting "flash" nothing to worry about. If you ever have the heads off, you can clean that up with a die grinder if you want it to look better.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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04-04-2009, 11:05 PM
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#7 |
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Formerly- 1972SuperCheyenne
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: Are these holes bad?
Totally normal.
__________________
--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
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04-04-2009, 11:07 PM
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#8 |
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PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,607
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Re: Are these holes bad?
Look just like mine...
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GO BIG GREEN GO DUCKSMEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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04-04-2009, 11:17 PM
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#9 |
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OurLadyofBlessedAccelerat ion
Join Date: Aug 2007
Location: Denver, CO
Posts: 148
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Re: Are these holes bad?
awesome. thanks everyone. very helpful.
__________________
_______________________________________________ 1968 Chevy C-20 w/ 396 1997 HD Sportster 1200 street tracker 1994 Chevy 1500 Silverado
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04-04-2009, 11:21 PM
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#10 |
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Roadtrip!
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,720
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Re: Are these holes bad?
I agree, just normal oil return passages. No worries.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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