800 rev aftermarket head

[OVERKILL 19]

Thanks, after talking with Tom he said I'm better off to port and polish than to go with a after market head, he said I will see better gains and a broader power through out the RPM range this way. So once I figure out how to pull the jugs I will send them out. Any one have a easy procedure to pull the jugs out?:

Found this on dootalk. Good info for those tearing down their engine for the first time. Thought I would pass along.

ski-doo snowmobile forums - DOOTalk.com

 

[Terra Alps Racing inc.]

we make heads to work for the mtns, also offer porting for mtn use, and big bores as well 830 ho and 860r's the best in the mtns, tested and proven.

 

[Deano670]

To get back on topic like i said earlier in this thread, to cut the head on the x engine is not going to gain you a bunch itself as the engine is 13:1 comp in stock form. Overkill you made the phone call and found out from the horse what to do.

 

[Terra Alps Racing inc.]

the deal with most aftermarket heads is in the dome design. the stock head with a wide 19.8mm squish band will work well in a rich condition, making the customer of the sled feel like there sled is running ok in most conditions. the problem with stock heads is the inconsistant squish depth, one side will be .050" and the other side will be .060" on the same hole, so some of the rebuilds we'll shave the head a bit then re work the squish so its the same or consistant for both cyls. but were not looking for power gains with this. just fixing a damage head and keeping the rebuild costs down for a client.

the aftermarket heads usually have a narrower squish band (10-14mm) to lessen the chance of detonation and will make max power with the proper air/ fuel ratio. or more power then the stock head. then theres different squish angles, squish depths, squish band widths, different radius bowls, some for lake racing back east and some for higher elevation mtn riding applications such as what we build. theres also different dome designs for different pipe applications. aftermarket heads will work better with higher comp motors , porting or having pipes.

Ted,

 

[OVERKILL 19]

the deal with most aftermarket heads is in the dome design. the stock head with a wide 19.8mm squish band will work well in a rich condition, making the customer of the sled feel like there sled is running ok in most conditions. the problem with stock heads is the inconsistant squish depth, one side will be .050" and the other side will be .060" on the same hole, so some of the rebuilds we'll shave the head a bit then re work the squish so its the same or consistant for both cyls. but were not looking for power gains with this. just fixing a damage head and keeping the rebuild costs down for a client.

the aftermarket heads usually have a narrower squish band (10-14mm) to lessen the chance of detonation and will make max power with the proper air/ fuel ratio. or more power then the stock head. then theres different squish angles, squish depths, squish band widths, different radius bowls, some for lake racing back east and some for higher elevation mtn riding applications such as what we build. theres also different dome designs for different pipe applications. aftermarket heads will work better with higher comp motors , porting or having pipes.

Ted,

All good info but is it worth the cash to put a head on as well, after porting?