[polarisripper28]

on here people talk about small and big block polaris motors. as an example my dad hasa 99xc700 is that a small or big block?

 

[dtmmil]

99xc700 and the 99 xc600 were both big blocks, not sure when they changed to small blocks though.

 

[polarisripper28]

whats the differencee

 

[birtchy13]

the smallblock motors had variable exhaust. the big blocks did not.

 

[polarisripper28]

ahhh

 

[Polaris_Parts_MN]

all 500 and 440 liberty twins are small blocks, regardless if they are VES or not.
the 600 VES is a small block, the 600 non-VES is a bigblock.
all 700 and 800 liberty twins are big blocks, regardless if they are VES or not.

 

[polarisripper28]

so are the big blocks all compatable with eachother example, bolting 800 cylinders to a 700 bottom end or 600 ves cylinders to a 440

 

[powersledder]

the smallblock motors had variable exhaust. the big blocks did not.

wrong

all 500 and 440 liberty twins are small blocks, regardless if they are VES or not.
the 600 VES is a small block, the 600 non-VES is a bigblock.
all 700 and 800 liberty twins are big blocks, regardless if they are VES or not.

wrong, some of the 500's and 440's were big blocks

so are the big blocks all compatable with eachother example, bolting 800 cylinders to a 700 bottom end or 600 ves cylinders to a 440

wrong


This comes up all the time, people need to start doing their own research instead of starting threads, You know there is a function called the search button right?


The designation of BB and SB came about from the size of the engines(physical size) the BB's have a bigger crankacse than the SB's

Big block: Some 440's, Early 600 twin, all 700/800 twin prior to 2007(besides the 755cc of 05 and 06)
Small block: newer(99 and up) 440's, 99.5 and up 600's (with VES) and the new (07 and newer) 700 twins are also referred to as SB's.

http://www.snowmobilefanatics.com/forum/search/display.aspx?terms=big+small+block

 

[xcr440]

As I am looking at the 440 and 700. Blocks are completely differnt sizes.

Small blocks have twice as many botom end fastners as a big block also.

 

[WMarshy]

Any idea if there is a data bank to run the block numbers through to tell if you have a BB or SM?

 

[points]

Here's the run down and for a note, this debate is refering only to liberty motors. (ie: domestic made twins)

The difference between the two is literally a physical dimension among other things.

Small blcks have a smaller case and are the 440, 500 and 600 cc liberty motors. Cylinders are interchangeable with some machining between small blocks. Waterpump and oil pump are gear driven.

Big Blocks have a beltdriven oil pump and waterpump mounted on the mag side of the motor. They are based on polaris watercraft motors and cylinders are interchangeable between 700 and 800 cc models.



Small block
97+ 440 VES
99+ 500 non ves and ves (liberty only, not the fuji 500)
2000+ VES 600
the new 700's and 800's are also loosely considered small blocks as I believe the use similar bottom end architecture but there are many differences now with the monoblock cylinders and such.

Big Blocks
98+ 600 non ves twins
97-05 700 Twins
97-05 800 twins

For the most part stuff is interchangeable on big blocks.