Which head?

[Nisse Järnet]

I am about to buy a new head for my Super Jet 650 with 61X 701 cylinders, pipe and so on. (My old one is cracked)
What should i buy??

[Nisse Järnet]

Re: Which head?

One more thing, how hig copmression can i have with 98 octane fuel?

[Bill O'Neal2]

Re: Which head?

Try www.pro-tecperformance.com

They are the only company that I know of who still make 650 heads.

[chris w]

Re: Which head?

It looks like you have a 701 in it?

There should be plenty available for that.

Your 98 octane fuel is 98 by RON method, different system that is used in the states which is RON+MON/2, the 98 is closer to our 91 "super" but not quite as good due to a big spread in the RON and MON.

[Nisse Järnet]

Re: Which head?

Try www.pro-tecperformance.com

They are the only company that I know of who still make 650 heads.

I got a 701 cylinder on my enginge :)

[Nisse Järnet]

Re: Which head?

It looks like you have a 701 in it?

There should be plenty available for that.

Your 98 octane fuel is 98 by RON method, different system that is used in the states which is RON+MON/2, the 98 is closer to our 91 "super" but not quite as good due to a big spread in the RON and MON.

Yep thats right! Yeah i know, but which one is the best choice? :)
Aah, thanks!! How big domes do you think i should have?

[Keith]

Re: Which head?

I would also suggest Pro-Tec. www.pro-tecperformance.com

They make a nice recreational head that is rated for 91 octane (U.S. rating) that doesnt require a head gasket part #14-9482. It also allows the use of the overtemp sensor if that is important to you. Costs $199.95 U.S.