As far as 6 cylinders go I've always compared pre crossflows to windsors and crossflows to Cleveland's, pre crossflows have a smaller port and velocity is your friend, crossflows have a larger more efficient port that responds better to camshaft changes so they are easier to make power out of than a pre crossflow, if you look up classic inlines from the usa they make an alloy version of our 2v heads, they might be able to refer you to a list of cam specs that work in pre xflow's

If you pull the starter off you can get to the converter bolts

Thats an interesting engine prefix and could be a x file,just make sure you read the block carefully,it all makes sense xcept the JK ,but i might have an answer for you ,my xf ute has a JL40 prefix and someone on here worked out where and what it was,could have been sparky dave,JL40 is the 2nd or 3rd production line at broadmeadows,JK IS THE NEXT LETTER TO JL,so it could be the answer,perhaps a special order car put together for reasons unknown,like a managers car or something,but other than that PU stands for july 1974 build date ,and your cleveland block is a garden variety d2ae casting 2 bolt mains.

i'd have assumed it to be either JG or JH 33, PU is related to something, i think month or year or both, the rest is part of the chassis number of the car.   if it is a JK? then it is something rare i don't recall hearing about. 

probably be advisable to edit the number out also, just incase there's a way of scamming it somehow (someone could duplicate the number perhaps if shonky?) 

Thanks for the help guys.  The block must have been painted a few times as I could see anything.    After wire brushing the area off I got JK33PU14837K.  Which I read as coming from a XB GT Sedan manufactured in June 1974.  I'm guessing the 14837K relates to the body VIN???

I was wondering if anyone knows how much better the crossflow head is compared to the 250 2V head on the pre xflow 250.   I would like to figure out how much info can be used on the pre xflow to produce comparable results to a decent xflow.   I would guess maybe 15% difference between the iron head XC and XA-XB 2V heads.   I know the 2V wouldnt compete with later XE-XF heads.   Do the 2V engines respond the same with similar cam profiles as the crossflow does?   My 2V engine currently has a 214 cam in it and I'm wondering how much bigger I can go in the cam with the older head.

Yeah, thats the casting number. Just used by the foundry. The engine number is between the dizzy and fuel pump, should be 10 or so hand stamped numbers JG34123456K or something. Matching numbers from the factory are the same on the block, the passenger side shock tower and the VIN tags. Doesn't matter if they don't, as long as the Rego dept has the recorded numbers on their computer. Most peeps don't bother to notify them when they swap engines out. 

That should be a D not J. D - 1970 2 - second year of that decade so 1972 A - Full size Ford E - Engine Plant or Division   CA - not sure exactly but could be certain revision.     4 - 1974 0 - month? 15 - day

engine number?  for rego purpose is on the front left side under the head(behind power steering pump on the block, )    those casting numbers are something @CHESTNUTXE usually has a fair amount of knowledge of. 

Hey Everyone,   I'm about to put my XE onto the Qld SIV register and am gathering all the info needed.  I pulled the starter motor to get to the engine number but I can't seem to find anything that breakes down the code for me.

I'm reading the code as:   J(upside down???)2AE-CA 4015   Anyone have a clue??   Cheers