K is St Catherine plant in Canada, all I could find is XJ, no XJA...XJ was 1969 350 2 barrel carb from C-50 truck(grain truck/delivery truck). From this size truck it would be 4-bolt main and forged steel crank if it is all stock.

Looks like you need to get the casting # off the rear flange of the block, or open it up and check the stroke.

 

The guy said it was a 350.

Bamaboy, how many times have I said on this forum....TRUST NOBODY.
You could have at least pulled a head to check the pistons and the bore size.

Copied this from a thread on ChevyTalk forum.....
"Generally suffix codes that start with an 'X' indicate a replacement engine from GM parts. A complete crate engine (less intake, distr, water pump) designed to be used in many applications and a range of years."

Hope you didn't pay good money for a 262.

 

Update.. number on back of block.....5.7, tells me its a 350....10263880...but the 4th digit is a little distorted so not sure if its a 4 or a 6. Almost 100% its a 6 though... now the sites I went on only showed it being a 4 bolt but it is a 2 bolt block.. ????.. will try to post a pic of it if I can figure out how.

 

update

Here's the pics...if I done this right.

 

The "880" block is a 350, can be 2 or 4 bolt main, has one piece rear main seal, can also be either roller or flat tappet depending on how it was machined.

 

Is there anyway to know which cam it has by looking at the cam? And how can I tell if its a vortec motor. And is there a significant difference between a reg 350 and the vortec? Sry for all the ?'s trying to learn.

 

Is there anyway to know which cam it has by looking at the cam?

Easier than that, pull either valve cover and loosen one rocker arm. Remove the pushrod and measure it. Flat tappet pushrods will be 7.800" to 8.150" (about 7 13/16" to 8 3/16") if measuring with a tape measure. Roller tappet pushrods will be 7.200" to 7.300" (about 7 3/16" to 7 5/16").

And how can I tell if its a vortec motor. And is there a significant difference between a reg 350 and the vortec? Sry for all the ?'s trying to learn.

'96-'02 L31 Vortec motors will have a 1-piece rear seal, roller tappet cam, tappet bores will be spot-faced to accept dog bones (tappet anti-twist devices), no provision on the camshaft for a mechanical fuel pump, different nose on the cam from a flat tappet cam, etc., etc.

 

There is no provision for a mechanical pump cause the housing has no hole for the pump rod..and I will do the measuring. Thanx for the info.

 

Measurement on push rod is 7 13/16"....thought I would let ya know

 

It's got a flat tappet cam then.

 

That's the performance difference. What I'm wanting to know is if theres a way you can visually tell a difference and if so what do I look for or is there a web site I can run the id # on that will tell me.

 

. The Vortec head casting numbers are readily available on the 'net... I think the best ones ends in -906... two numbers for 350's... one for 305's...

 

Vortec 350 head casting #'s to search for end in "906" and "062". Good ones for a 305 end in "059".

Vortec heads have a vertical 4 bolt intake bolt pattern, straight up bolt like a Small Block Ford.

Older non-Vortec has 6 angled intake bolts per head.

 

. Now that I see both numbers, don't recall which ones flow the best... I think one Vortec 350 head casting # has valve seats that kind of stick up and block airflow, as I recall...