I was told the heads I have are 64 cc so I figured they would be ok to use. I knoe they are the swirl port head that noone like but they are truck heads for low end torque thats why I kept them and didnt use the vortec. Do I have to mill the vortec heads down. I dont have the extra money to get them done or the time to wait. Also I have heard and seen many people using 350 heads on 305s. I didnt think it would hurt anything cause Ive seen it done. Actually my neighbor has 350 heads (193s) on his 55 chevy with a 305 and it runs good.
Last edited by allansmith859; 11-18-2012 at 12:06 PM.