Ok, so I was perusing ebay and found this:...
Ok, so I was perusing ebay and found this: http://cgi.ebay.com/ebaymotors/FERRARI-308-GTB-QUATTROVALVOLE-Gr-B-cylinder-heads-set_W0QQcmdZViewItemQQhashZitem3350605c1dQQitemZ220391824413QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories Which advertises itself to be Group B heads. What would likely be the difference? Porting/polishing?? What sort of HP gain would you expect? I know a few people on here are making 308 racers including Group IV/B cars. Just being curious... For the record - I have NO association with the sale of this item. PDG
Impossible to discern what that seller is talking about without details regarding what was done to the heads or flow numbers supporting their modifications