how to achieve 600 to 650 hp sb 408?

ou812 said
Heads may not flow well...seen this with other "ported" indy heads. You must me using an adapter on the indy intake...I cnc the opening and port the plenum so you can mount the 1050 on the flange with no spacer.
Cam is small and way too conservative. Headers are small but can make 600HP. Are your pistons dish? Chamber volume? Rockers and ratio? Did you line hone the block with the girdle?
Brian

the heads has been tested they flow 307 on 650 lift that guy that flowed them has all the numbers so i can them if want and show you? yes i use and adapter to the 1050. the piston is dished and i have filled it with liqiud and the result was 26cc and the heads cc was 62 the rockers are td machine 1,6 rockers and the block is line honed thanks from niklas