Evolution or Revolution? Darts BB Chevy heads.

[DavidVizard-GFN]

Originally Posted by nomad

Thanks for the info on the Iron Eagle BBC heads. I've gotten to the point where I want to do my bracket racing on a budget. The 308 cc heads would go just fine on the 496 I'm planning and gathering parts for. My only concern is that I want to use these with 93 octane pump gas. Would that be a problem?

Bruce

Bruce,
I don't have all the answers on Iron Eagle Darts but to date I have seemingly found that the chamber shape is reletivly insensetive to detonation. We have used up to 11.5/1 with Iron Eagles on the dyno and, with everthing set right, seen no detonation on 93 octane. Water temp is something we monitor closely as this has a distinct effect. I feel it should be kept to no more than 170 if 93 octane fuel is to be used at these higher CR's.
DV

[nomad]

Thanks David. I'd like to be below 10.5 compression. I'm using 781 heads now and I'm in Florida so temperature managment is something we pay a lot of attention to. I just see these heads as an good economical alternative to an alloy piece. Based on the combustion chamber photos I'd say the casting would be pretty good.