I've got a set of 487 heads which have been extensively ported,had bigger valves fitted,screw in studs,new springs etc.I've done a search and come to the conclusion that in modified form they're not too bad on a N/A motor but will be outperformed by new aftermarket heads.How would they fare on a turbocharged motor?They have 76cc chambers to help to keep the compression down.I don't really want to shell out on another set of heads at the moment.Any suggestions help would be appreciated.

 

personally, I feel that 487's done right would make killer 'charger heads...

FWIW, they are actually 75cc heads