Super Jet Do they make head spacers to lower compression?

[701SJFMT]

I was wondering if they make head spaceres to lower compression. My 90 sj with a 650 has 210 psi after i rebuilt it. I was told the ski used to be a race ski at won point. It looks like a stock head that was milled. I purchesed wisco pistons . they were not domed. I cant beleave the comp . The ski runs great and screws for a 650 . but race fuel is getting expensive. I want to keep the head thats on it becaues it already has duel cooling. Any advice?

 

[Big Kahuna]

Get a thicker head gasket or find an ADA HEAD.

 

[Freakrider]

why not blend a little race gas or avgas with premium ? 210 is not that super high on a SJ (light load hull) unless you are running wide open throttle/high rpm runs...I say run it !

 

[Loganpsd]

i build a big bore motor that had to much comp, i made another base gasket, i got come .03 gasket materal (.01 thicker) it dropted about 10psi

 

[Boris]

Those 650 can take that compression on pump gas and live happily at WOT.
I tried killing mine and couldn't.

Just run it and if it does blow, it's only a 650.