700 BIG BLOCK WITH 800 BIG BLOCK CYLINDERS????

KCM · Feb 2, 2011

:face-icon-small-shoI HAVE HEARD THIS IS POSIBLE I HAVE 1998 XC700 BOTTOM END AND 2001 BIG BLOCK NON VES CYLINDERS AND COMPLETE TOP END. MABE JUST THE PINS NEED CHANGED HAS ANYONE RAN OR BUILT ONE OF THESE WITH STOCK PORTING PEOPLE SAY THEY ARE A GOOD REV MOTOR WHAT IS YOUR IMPUT????????????????

madgrip406 · Feb 3, 2011

im about to buy a 99 rmk 700 xc with a 03 800 xc motor in it. i would assume the bottom end is a 700 and the top 800. but i am just guessing.

RMK4life · Feb 5, 2011

I would think that you could bolt them together and be good to go. If you dont get your answer here I would go down to your local dealer and ask them if it would work.

madgrip406: Im pretty sure that the motor in your sled is a complete 03 800 from top to bottom. Im pretty positive that those 2 motors wouldnt fit together.

madgrip406 · Feb 6, 2011

ok thanks

X2Freeride · Feb 20, 2011

Incorrect. This is not a bolt together deal. The 700 connecting rods are 2mm shorter than the 800 rods are. So you need 800 connecting rods, The cylinders, Pistons, a 800 head and water jacket.

X2Freeride · Feb 20, 2011

madgrip406 said:
im about to buy a 99 rmk 700 xc with a 03 800 xc motor in it. i would assume the bottom end is a 700 and the top 800. but i am just guessing.

That guess would more than likely be wrong. The 800 and 700 use the same crank and case but the connecting rods are different lengths 800 2mm longer so Id say it was a complete engine swap. The case porting for the 03 800 would be different anyway.

KCM · Feb 21, 2011

Right the rods are longer on a 800 but i was told you need to use special pin bearings and then the 800 big block cylinders (non ves) should go on using the shorter stroke rods Im sure someone has done this it makes like a 780cc.......

X2Freeride · Feb 21, 2011

KCM said:
Right the rods are longer on a 800 but i was told you need to use special pin bearings and then the 800 big block cylinders (non ves) should go on using the shorter stroke rods Im sure someone has done this it makes like a 780cc.......

That would be correct. I believe SLP or someone like that used to make a 780 kit back in the day for these sleds.

Not sure who would make the pin bearings. I know they would have to be different than the 700 ones for this to work. Might try calling slp and seeing if they are still available. Maybe even Wiseco?

KCM · Feb 22, 2011

goinvertical · Mar 2, 2011

780

Back in the day when I was trying the same type of build, I believe only HPE offered a piston kit. Not sure if they still do or if that was even the correct outfit. I do know, that the people that ran them, said they ran well. I just threw in the towel on my build and put 800 cyl.'s on it and went sledding. Just my 2 cents.

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700 BIG BLOCK WITH 800 BIG BLOCK CYLINDERS????

KCM

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