SS Lancer
Well-Known Member
Someone please tell me why this unusual machining was performed above lifters in the smallblock ????
Maybe they ran magnum heads for the push rod clearance or some sort of valve train angle machining.
All original 1972 LA smallblock !
Has these rarely seen heads on it also.
View attachment 1715424251
This part number is whats uniqueWhat's rarely seen about them?
Ok thank youIt 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..
66-67Thanks but that did not help in anyway.
Perhaps the casting number between the the set of intake runners under the head?
66-67
273 casting number
234-2 !!!
Thanks but that did not help in anyway.
Perhaps the casting number between the the set of intake runners under the head?
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 clearanceOk 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.
Thank you SirYea 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
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.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..
Thanks for block infoFrom 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.
Ok thanks info kinda hard to find for 234-2Not 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?
Someone can chime in an old thread mentioned the 234 as having smallest cc of all LA cyl heads.Ok thanks info kinda hard to find for 234-2
Just info I ran across