- Dec 18, 2003
306 , stock block ,stock crank, edelbrock RPM heads , cobra intake ,eagle SIR rods , keith black .150 dome pistons . compression should be 11.1 with these heads ....I am looking at the X303 cam .....the springs on the heads are only rated to .575 lift so I didnt wanna push them right to their limit and I dont wanna spend 300 dollars on a cam either .....any suggestions ??? any ideas on how much HP this combo will put out? ....