[Rich Biebel]

I just watched a video of some dyno testing on a 70 W-31 350 Olds engine
10+ to 1 compression with 2.07 intake valves and the factory aluminum intake with headers
It made exactly what the factory rating was 325 hp at 5400
Was a stock cam and freshly rebuilt +.030 engine

Could one make 400hp ? Sure but it obviously would take more than just some different factory iron heads !!