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Old 05-18-2010, 06:18 PM   #12 (permalink)
robertwb70
EcoModding Apprentice
 
Join Date: Jul 2008
Location: Florida
Posts: 135

1991 RED Metro 1.0 Auto - '91 Geo Metro Lsi Auto
Team Metro
90 day: 38.28 mpg (US)

1991 3/5 2 door Blue/green - '91 Geo Metro
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Quote:
Originally Posted by halflingsrock80 View Post
With the 64cc chamber can I still run 87 octane?

Also, I notice this is not "50 state legal"meaning no heat cross over for EGR. So any idea if the fact this is a more efficient head design makes EGR obsolete?
Yes 87 would still work if tuned properly, check out Hot Rod Magazine, they've done a few dyno builds/ tests with these heads and cheap gas.

As far as EGR I'd say "kind of", it would be nice to keep the EGR but SBCs run fine without it, none of mine have ever had it. I think the heads have EGR provisions so it depends on the intake to keep it functional but it should be pretty easy to have EGR if you want it.

*Looks like I posted at the same time you did.

Last edited by robertwb70; 05-18-2010 at 06:35 PM.. Reason: simultaneous post
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