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Username Post: Oil feed hole in block        (Topic#360831)
Sean e 
Newbie
Posts: 4

Reg: 05-06-20
05-06-20 04:49 PM - Post#2793027    

Does anyone know what production date Chevy started casting an 11/32" hole in the block for full flow oil feed to the head, thanks?



 




grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17510
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
05-06-20 06:19 PM - Post#2793035    
    In response to Sean e

what engine family?
SMALL BLOCK?
BIG BLOCK
W series?
LS series?

if your referring to a sbc?

there are no pressurized oil feed passages to the heads??
]
oil to the rockers feeds from pushrods



http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 05-06-20 06:28 PM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4494

Reg: 12-29-02
05-06-20 08:26 PM - Post#2793042    
    In response to Sean e

What engine family are you asking about?

Pressurized oil fed to the head(s) is typically only used to lubricate overhead cam(s).


Chevy small blocks, big blocks and LS V8's do not have pressurized oil to the head.




 
Sean e 
Newbie
Posts: 4

Reg: 05-06-20
05-06-20 08:31 PM - Post#2793043    
    In response to 65_Impala

It’s a 1958 235 eng, oil is not getting to rockers



 
65_Impala 
Very Senior Member
Posts: 4494

Reg: 12-29-02
05-06-20 08:50 PM - Post#2793044    
    In response to Sean e

1958? Hopefully this helps. Follow the links to see other years.


http://1954advance-design .com/Web%20images/1958-60...


Use of the correct lifters would be the first thing to check.




 
Sean e 
Newbie
Posts: 4

Reg: 05-06-20
05-06-20 11:47 PM - Post#2793052    
    In response to 65_Impala

Thank you very much!!



 
shadetreemech 
Newbie
Posts: 2

Reg: 05-07-20
05-07-20 12:32 AM - Post#2793053    
    In response to Sean e

Ok, so I'm working with sean on this project, and in the process of familiarizing myself with the ins and outs of this motor. In a nut shell, while diagnosing some excessive valve clearance on the #1 cylinder, I noticed two issues. The first being lack of oil flow to the top end, and the second being excessive play between the offending rocker and shaft. What I know for sure, is it's a late 58 motor. I have not had a chance to pull the numbers off the head yet, but noticing the crimped off end on the oil supply line, I have to assume it's a 59+ rocker assembly and head. First step is figuring out the oil supply problem, second would be repairing/replacing the rocker shaft and rocker assemblies. To make sure the proper parts are ordered, i need to find the exact date Chevrolet switched to 11/32" oil feed galley in the block. Was it a running production change in 58, or 59, or is there a way to verify the size of the orifice in the casting without pulling the head? Any help is appreciated. Thanks, Chris.



 
acardon 
Ultra Senior Member
Posts: 11379
acardon
Loc: DFW TEXAS
Reg: 03-25-05
05-07-20 05:36 AM - Post#2793058    
    In response to shadetreemech

You might do better in the 58-60 section above. 235 doesn't fit very well in the high performance section. Just kidding, but there are likely more 6 cyl guys there than in this section.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 




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