Educate me please !!! LA info needed

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SS Lancer

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Someone please tell me why this unusual machining was performed above lifters in the smallblock ????

20191116_144650.jpg
 
Maybe they ran magnum heads for the push rod clearance or some sort of valve train angle machining.
 
It Is from the rough stage of machining of the block for lifter holes for clearance. so final tooling to bore and finish valve train lifter bores ..
Retired form Chrysler Trenton Engine plant ..Seen a lot of them..
 
It Is from the rough stage of machining of the block for lifter holes for clearance. so final tooling to bore and finish valve train lifter bores ..
Retired form Chrysler Trenton Engine plant ..Seen a lot of them..
Ok thank you
This is a 72 model block
I have a 68 - 70 - (2) 74 model blocks all trucks blocks like this one and none have this machining so was just curious.
 
Thanks but that did not help in anyway.
Perhaps the casting number between the the set of intake runners under the head?
 
Ok thank you
This is a 72 model block
I have a 68 - 70 - (2) 74 model blocks all trucks blocks like this one and none have this machining so was just curious.
Yea they used multiple tools at once to bore, Also they started around that time with like a sizing tool in cutter heads so they need clearance
 
It Is from the rough stage of machining of the block for lifter holes for clearance. so final tooling to bore and finish valve train lifter bores ..
Retired form Chrysler Trenton Engine plant ..Seen a lot of them..
So was this something done after a certain year? Or just by a certain block plant? I've never seen it on a factory built engine. The engine Chris is talking about was as built when new, Bearings were dated 2-72 so it is a virgin engine.
 
In the photo in post 1 of the block the slots look deeper on the left then the right, would that have been due to casting creep ( or whatever it's called)
 
Oh ****, look there are no ribs between the lifters! I put out the word that I needed to know WTF those ribs were hiding and now we got the answer...nothing! I bet they are put in there for cylinder rigidity. I chucked my short 'B' rollers into my 360 and they are a big 'no way' even with V link bars. The link buttons totally hit the block. The LA retro rollers must be very tall to clear that area with buttons in the rear.
 
This block looks like the one a guy posted up about a week ago hat had some epoxy all plastered around inside there. Different block but it had the vertical grooves in it also .
 
From post #1; those machined areas are for cutter clearance when the lifter bores are machined. I've never seen them on any blocks I've taken apart. If you look at the cutter marks, the front cylinder has none, and they get deeper as they reach the rear cylinder. This tells me that the outer mold wasn't properly aligned when the block was poured.

From what I found out those heads are from a 1967 318 truck engine with a water heated intake manifold.
 
From post #1; those machined areas are for cutter clearance when the lifter bores are machined. I've never seen them on any blocks I've taken apart. If you look at the cutter marks, the front cylinder has none, and they get deeper as they reach the rear cylinder. This tells me that the outer mold wasn't properly aligned when the block was poured.

From what I found out those heads are from a 1967 318 truck engine with a water heated intake manifold.
Thanks for block info
This is what I found on cyl heads
They have the smallest cc of ALL
Oem LA heads !!!!!
234 casting # shown on photo enclosed

Screenshot_2019-11-13-11-36-00.png
 
Not sure I'd believe that picture information. 2658920 did not have 1.88 intake valves. I'm pretty sure all early 273 heads had the same closed chamber. Have you measured them?
 
Not sure I'd believe that picture information. 2658920 did not have 1.88 intake valves. I'm pretty sure all early 273 heads had the same closed chamber. Have you measured them?
Ok thanks info kinda hard to find for 234-2
Just info I ran across
 
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