Whether you rotate the crankshaft by hand, or just "bump" it with the starter, that will still destroy cam bearings if the dreaded "stiction" disease has occurred! You must create some oil flow to all lube points before attempting to rotate the crankshaft at all!
The "l" bracket you describe for the throttle return spring anchor does indeed "sometimes" have "345" stamped on for an id point...but not for identifying which engine per se. And not all of those anchors are stamped with any designation.
That anchor has to do with a change in intake manifold/carburetor list number, and throttle lever actuation as those motors were installed in various platforms over time. There were two distinctly different intake manifolds used with those engines, many have been mixed and matched due to po virus. The anchor was not used on earlier vehicles since they had a totally different throttle actuation system and return spring setup.
When the egr 2v manifold for the 345 was intro'd on the light line stuff, the manifold and carb redesign came about, along with a shift to a cable operated throttle lever...that is when that spring anchor began to appear. And, keep in mind, these engines were used in hundreds of non-motor vehicle apps also with all kinds of carburetor variations. That anchor might have originated as a "tractor" or "ag division" part originally for a combine or tractor as those apps used somewhat different numbers for basically the same part id as compared to the "motor truck" side of the bizz.
I find those same spring anchors used on both 304 and 392 motors also, they are just a "part", nothing significant. Most of 'em have no numbers stamped in.
Phillip posted a nice pic of the sv (and I-4) engine timing grid. Looking at his pic...the zero point denotes tdc on #8 cylinder for either the compression stroke or the exhaust stroke. The "5" tik Mark above the zero point denotes "five degrees after tdc. Below the zero point in the pic, you see the grid denoting 5 degree increments before tdc.
Why does the hash Mark on the crank hub/balancer reference cylinder #8???? Simple...the I-4/sv motor balance scenario originally used a "crank hub", not a "harmonic balancer". What we call a "mutton chop" hub or a "cutaway" hub.
Due to the crank throw indexing and the way the engines were balanced, there is nothing but air on the hub when #1 cylinder is at tdc on the compression stroke! No place to stamp a timing Mark!
The "harmonic balancer" system was phased in on some 345 engines over time, and also used exclusively on the 392 version. But look at the harmonic balancer...it still has the "mutton chop" segment behind the vulcanized hub.
If ya go to this link:
http://www.forums.IHPartsAmerica.com/gas-engine-tech/1144-ultimate-IH-fourbanger.html
And look at post #37, you will see a pic of a "crank hub", that one is matched to one dedicated 152 rotating assembly, the balance drillings are evident. That exact same "raw" hub was used for 196,266, 304, and "some" 345 apps over the years...but...each one was drilled for it's mating engine assembly. Ya don't mix and match these parts or swap 'em around without expecting engine balance to go to hell. The hub in that pic is actually going onto a 196 crankshaft as part of a stroker engine build. Once all the parts are gathered and the block is bored to the pistons we're gonna use, then the entire rotating assembly will be balanced along with the clutch and flywheel set that's going behind it.
Yeah...they could have designed a totally different "system" for the crank hub/balancer...but why reinvent the wheel for an engine where by the mid-1970's the entire focus was on making 'em meet emissions and reducing manufacturing costs across the board. IH mechanics had been used to working from #8 tdc since day one, who gave a shit about that, if you were "trained" ya just knew this stuff!
Same way ya know that the timing Mark on the IH sixbangers is on the flywheel, hidden behind a flap or plug in the forward portion of the bellhousing! Same reason the distributors used on many of those sixers have a timing grid incorporated into the distributor mounting system!
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