that looks like the "Sport" body (ute), which was less common than the regular-bed model, at least in USA.

Also had 4-speed column shift!

I love the high compression big radicle camshaft , ground thumpin sound and feel from a 4 banger!!!!!!!

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The only real problem with this setup is that the little end of the A12 rods must be bored to take the larger wrist pin of the A15 pistons, which reduces their strength.

I ran A14 pistons in my 1200GX engine for an awfull lot of miles, first at the standard 76mm, then later at 76.5mm, with bored A12 rods. They never gave trouble, but i don't flog my engines like some do, & the possibility of rod failure was always something that i had in the back of my mind.

The right rod to use in a big bore 1200 block with either a12 crank & A14 pistons, or A14 crank & A15 pistons, come from the A12A engine.

I think that an A15 crank in an A12 block would be one of those projects that stoped being fun real fast.

Now this is where things get tricky, how can you have a good strong power output and still retain driveability? with Turbo power, you get great top end and fairly strong mid range but the cost is lag and sometimes hotter temperatures, with Naturally Aspirated power you can have high compression pistons and crazy spec camshaft making high power at 7500 rpm but you can have a nightmare getting it to idle and drive off in first gear without spinning the wheels or wearing the clutch out sooner and with supercharging you can have some different results by being able to switch the solenoid on the clutch on the supercharger snout off so you can have smooth driveabilty but because you would need to lower the compression ratio for the extra boost and retard the ignition a little your power can suffer during the time when the supercharger is not working. I guess the only answer would be to go with what you like and don't look back. Unfortunateley for me I love HUGE revs from my motorcycle days, love the high pitched screaming turbos and love the sound of the supercharger gears and gilmer belt drives whirring and whistling so I am damned to live in a world of curiosity and forever dreaming of a way to have it all!

i belive it is a a14 crank in an a12 block, . on a12 rods with a15 pistons.... i always forget the crank that he has in it........... but that motor, who ever is running it may not be running for much longer, cyl 3 is down on compression.... about 35% lower on comp then the rest... i hope that person has a bit of luck soon.... i guess its not so secret any more that mild man has spoken...

Quote:This is, to some degree, one of those unanswerable questions as engine service life decreases substantially as ultimate power limits are reached, & driveability just about dissapears. Cost goes through the roof too.
A good dose of nitro combined with some serious boost will find the limits of both the power & life expectancy of any engine.

What is it that you plan to do with this engine? Street? [modest level] Race? [high level] or Drag? [very high level of power output]

i would be interested to know abit more about this a15 crank in a12 businesses i have got both engines and i am looking for max power. Does any one know the limit of power achiveable from a turbo a15?

Your right it could be a challenge Dodgeman, I haven't done it myself....I do know of a certain ute in this area that defintely has an A15 crank in it...I assume it has the A15 head on it as well, but not entirely familia with the setup....

I'm being evasive as I don't know if he wants people to know about it or not...

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If you have the 1965 model, then it will have the J12 engine & not the A12 which was first seen in 1970. The simplest swap would be the J15 engine & these should not be too hard to find, although you would likely need to major overhaul any J15 that you were going to use.
If your engine is the J12, then have a think about the J15.

Plan B?
An L series engine & five speed. You should be able to get a Series One Bluebird, or 200B type L20B engine & box for next to nothing these days & they are a strong & reliable power plant. This should perk up an old truck quite nicely.
The Series Two Bluebird engine [L20B] is also a good candidate, but it has a lot more smog gear to fiddle with.

Plan C?
An A15 & gearbox from a late '70's or early 80's model Vanette.
All of these choices are good, but one of then will suit your needs better, & only you can make that choice.

Mildman
I know that the A14 crank can be used in A12 blocks without too much drama, but i think that the A15 crank might be a bit of a challenge.