head gasket 340 liquifire

storm_00 · Post by **storm_00** » Fri Sep 29, 2006 4:14 pm

ok harley here we go I was wondering if I have to have a head gasket or can I just have the head machined to run flush on the block right now there is a thick gasket on there an I am lookin at any performance edge I can get the other question is on exhaust if I chang that out an runn twin tunner pipes do I need to change out my carbs ya I know its alot of work for a 340 but its what I have to work with also what is the best compession for this impaticular motor my buddy has 165 in his trail fire an I am pretty sure I dont have that much but then I am not sure what I should have .

also before I forget do ya know were I can find the foam handle bar peice for my sled I check around here an had no luck an I dont think I can make one .
wayne.

harleysportster · Post by **harleysportster** » Sat Sep 30, 2006 9:21 am

Wayne,
I am not the one to answer any high performance questions. I don't know how much can be shaved off the head and still be safe. The gasket serves 2 purposes on the liquifire. First, it seals the combustion chamber,second it seals the water jacket since the engine coolant flows thru the head and around the cylinders.
The stock exhaust pipe was tuned for the best performance for that engine. The only other pipes that I know would work with good results are a set of dator pipes or one set made by Aien(?). The carbs will have to rejetted once the exhaust is changed.
The compression on a rebuilt stock engine should 120-130 psi for the 76 340 liquifire.
The center foam cover is the same for the later 00,X, and cyclone series snowmobiles.
Rebuild and maintain your liquifire for what it is, a 76 vintage snowmobile and you will enjoy it alot longer. If you want a faster sled, buy a newer one.