1998 1800 twin wondering high allitude

[mogg355]

I was told that there was once heads available for the 787 motors that had interchangable domes in the heads, to allow adjustment for high allitude performance. Does anyone know of these. and maybe the option for impellers also for high allitude. And where these can be found. New to the site much information to be taken in. Thanks for any help

 

[seadooya]

ypu, your correct, i'd start with the aftermarket headm or if yuo know that you'll be running it up in the elvation "always', then i'd just mill the head. As for impellors, skat-trak, or solas will lead you to what yuo need.