I am looking for an engine number for identification purpose's

Unlike French cars which tend to use number four cylinder as the timing cylinder, almost everyone else including Isuzu use the traditional number one as the timing cylinder, not that for practical purposes it matters very much as it is a simple matter to discover which cylinder is at the top of the compression stroke and then fit the distributor with the rotor pointing at the distributor cap segment for that cylinder.

It is the direction of distributor rotation that confuses people more than anything as many rotate anti-clockwise although I believe the one you are working with rotates clockwise. Another problem with many traditional distributor installations is they often share the oil pump drive which must both be aligned before the distributor will successfully slide home and then because of the skew-type drive gear the distributor turns considerably on the way in and then the rotor is found to be misaligned. The apprentice mechanic soon learns to anticipate and allow for these things.

If the same distributor is being refitted it is best to make alignment marks to cut the amount of time and effort. Few engines require the removal of the distributor for routine timing belt replacement and usually all that is needed is an ignition timing check with a stroboscope.

I am not an informed enthusiast but I believe that casting number can end up as a variety of engine capacities in a variety of models.

It is not the casting number that is important but the engine number that as standard is stamped on an aluminium plate and riveted to a pad provided for the purpose on the top of the cylinder block. The plate is often removed during engine overhaul and rarely refitted, though sometimes the number or a number is then stamped directly into the cast iron where the plate was.
The number will usually start with the prefix 99H or similar and the capacity of the engine is likely to be 997 cc or 948cc though without the engine number and a degree of experience and reference matter it could be almost anything from 848 to 1275 considering how people commonly sourced replacement engines for their old cars.

Hi Simon,here's a link to where your engine number is. Repair Guides Engine Identification Engine Identification AutoZone com Here's another for what each number means. Repair Guides Vehicle Identification Number vin Vehicle Identification... Here's a link with your vin numbers to check out parts and buy,I have bought parts from here,I have a silver 85 nissan 720 4x4 in mint condition. Part Detail need more help,just reply back Simon.Here's my nissan, 85 Nissan 720 4x4 Silverbullet 4 with Samantha YORKIE at the wheel look...

ENGINE IDENTIFICATION NUMBER STAMPED ON THE FRONT SIDE OF THE ENGINE BLOCK NEAR THE TRANSAXLE.

THE ENGINE SERIAL NUMBER IS STAMPED ON THE SIDEWALL OF THE CYLINDER BLOCK AT THE TRANSAXLE SIDE. THE BODY NUMBERS IS ON THE VECHICLE IDENTIFICATION NUMBER PLATES LOCATED AT THE TOP LEFT OF THE INSTRUMENT PANEL.AND AT THE FIREWALL IN THE ENGINE COMPARTMENT.YOUR VECHICLE REGISTRATION IDENTIFICATION CARD IN GLOVECOMPARTMENT HAS VECHICLE IDENTIFICATION NUMBER.THE 17TH DIGIT CODE IDENTIFIES MODEL - YEAR - BODY TYPE. NUMBER 8 COUNTING FROM THE LEFT IDENTIFIES THE ENGINE USED IN VECHICLE.

look under the hood there should be a label that says what size it is,or take the vin number to the dealer and they can tell you by vin#

if you are wanting to determine the year of the vehicle go by the 8th character of the vin and it will let you know. also the 10th character tells you the engine size.

I think you are looking for the VIN (Vehicle Identification Number). If this is right and there was a translation or typing error then here are a couple of other locations for the VIN besides the engine. It can be found on a plate on the driver's side door and on a plate on the dash in the lower corner of the windshield on the driver's side.

ok there are several places to look
the door panels stickers
the glove box
the engine compartment
manual
the engine number will be stamped on the block if facing truck it would be on the bottom right hand side between the first and second freeze plug