SX/SXi/SXi Pro 27cc domes for 750 westcoast head!!!

[Turbo_Tim13]

I just got a 750 Westcoast Head with 30cc domes and im going to put the head on my 650SX, im trying to get the compression up to about 175 so im looking for domes that'll work the best which i've heard 27cc domes will get you closest to 175.

Anyone with domes they can sell me, please let me know, engine is currently all apart and im trying to get it all back together as soon as possible.

Thanks

 

[kevbo]

I always got 180psi with 30cc domes on stock cylinders.

 

[Turbo_Tim13]

And your just using a 750 head on a 650 like me?
Are you using the o rings or normal head gasket.

Thanks for the info.

 

[kevbo]

The first Westcoast 650 heads were unique but the later versions used common shells for both 650 and 750s. These 650-760 heads use protruding domes that sit directly on the cylinder and a special Westcoast gasket that clears them. I always had problems getting them to seal and ended up using two stock gaskets with one cut out to clear the domes and match the water holes.

 

[Turbo_Tim13]

My ski is an 89' which i think is the earlier year, but im gonna do some experimenting and see what happens, i'll just go back and forth with compression test to see what works the best.

I have a Wiseco top end kit on its way so i'll have a fresh head gasket and my old one that i could possibly combine, thanks for the tip.

Im hoping to see a big improvement.