Question about cool head domes

[Satsol67]

I was wondering how much if any gain I would get going from a 22cc dome to a 20cc. I dont want to have to run race fuel. I would like to stay running 93 oct. I am in the proccess of doing a top end rebuild and would like to know if changing from 22cc to 20cc/19cc would make much of a difference. Also would i have to rejet? My mains are 280's now.

 

 

Thanks

 

Ron

[Animalman294]

Going to smaller domes would deffinately get you more power gains, because you are increasing your compression. As far as runnin' 93, you need to do a compression check to find out. You eleveation plays a major role in this as well. If your compression is above say 155 you will need to run, at a minimum 50/50 race 93 or AV100LL and 93. You best bet is to contact NOSS on here and talk to him, and he'll hook you up with you options............. :beer:

[Satsol67]

What compression should I expect with a fresh bore at 64.50 with the 20cc domes? I live in the Upstate South Carolina area. Is there a site that you guys use to check the exact elevation?

[Bansh-eman]

around 140 or so

[Satsol67]

if that is the case then 20cc domes should be fine running 93oct.

 

Will i have to rejet?