Are you just doing this so you can keep the early a12 so the engine mounts will look original?

Yes, that is one of the reasons.

I have a perfectly good [rebuildable] 1200 GX engine & it fits the chassis without any mods, so why not use it. At my age, i have had my fill of blinding acceleration & dazzling speed. All i need is a car that starts easily, every time, sounds good, runs quite well, & posts a respectable point to point time.
That takes a balance of components, not impressive power outputs.

This engine will look for all intents & purposes like a factory instalation, it will pass as a 1200, but will run just a bit better, with an emphasis on torque over horsepressure. The GX carb setup is a surprisingly well sorted design for regular street use, & it fits under the bonnet without problems or alteration.

So, yes, because it fits without mods, & because i have one. Waste not, want not.
Besides, "Q ship" is a forgotten "old school" trick.

d-man,one trick taught to me years ago by an engine builder friend was to peen in the plugs for the oil galleries.these are a press fit,& the
a15 i was working on at the time had dropped
one of these plugs out.this had caused a lack
of oil pressure,but fortuneately the engine was stopped straight away,so no bearing damage.
just another thing to do during crank preparation,i suppose.

B310GX
Thanks for the tip.
If i can, i will tap a thread in these drillings & install some taper thread plugs.
I hope to follow the factory info & enlarge the galleries in the crank. Depending on what i find, i may cross drill it too. I also plan to use main bearings that are grooved both top & bottom.
You just can't have too much lube "available" to the bearings.

That sticker on your moniter is soooo cool. I'm quite suprised that you don't use that for your signature. And yeah, too much lube is just enough ( ask my g/f) lol

Quote:
right... so dodgeman, now we know why you don't like chevs

Dude, before you put this crank back in, why don't you knife edge and polish it. There are many benefits from doing this, such as torque, smoother power, revability, may even make the oil properties last longer, being not not so aerated.
Just a thought.

lata :)

A14force
I don't use it as a signature because it isn't really Datsun related, & i kinda like the one i use. In my other [Mopar] life, i use the phrase "If it aint Mopar, it's below par" [not under par, which is a diferent thing completely]

Dazzasute
The Chevrolet division make an extremely popular, & perfectly servicable range of cars & engines. These are so popular that they have become widely known as "bellybutton" motors. [everyone has one] It's hard to be individual with one of these.

If i was to be a GM fan, i would have joined the tribe of "Chief Many Horses" [Pontiac] as they produce a range of cars & powerplants that could arguably be claimed to be a good runner up to my beloved Dodges.

My Dodge hemi was built at a time when engineering came first, & nobody in the industry has, or could, seriously claim that any other automaker put more quality of design & manufacture into their engines than Chrysler corp did in this time frame. The third generation of Dodge hemi is still in production, 50 years after the first one, it's that good.

120Ynutter
I won't be knife edging this crank as this is a street engine, which will be red lined at a paltry 6,000 rpm or so & it simply isn't justified, but they sure look nice. The extra rotating mass of a stock crank is of more benefit in a street engine, while the knife edge crank is just the ticket in a race engine with a rev limit that is approaching near twice this figure. Besides,... have you priced this kind of work? Yeeee ouch.
As long as the crank keeps out of the oil, there should be no problems with "windage", & in a street engine, this is not normally a problem.

Chris

What you say is very true Chris. Chrysler's level of engineering is a cut above the rest. Just compare the front pulleys of a 350, or a 308 with the front pulleys of a chrysler V8 while they are running. The Mopar ones spin as true as can be, the other stuff wobbles around like the wheels on a clown car. Wait a minute, if it's not a Mopar, (or a datto) then it IS a clown car!!!!!!!lol