360 head porting for big power (500HP ?)

I may have missed it but can you tell us what size the chambers are? If I'm not mistaken, 308 heads usually come in around 68-72cc. Were the surfaces cut at all?

Couple more questions - are you going to have to machine the spring seats at all? Just thinking ahead to when you start checking clearances and spring heights.

What valve seals, retainers and locks are you going to use?

Are those Crane rockers bushed? I have a set of NOS 273 rockers I thought would cool to go nuts with - bushings, modern adjusters etc.

Personally, I'd be interested in seeing how these heads are finished up when you're done with all the machining. I'd really like to see how close you can get things to match up from valve to valve.

I'm of the school of thought that if all the individual parts are made to operate as equally as possible, you will have a better running engine, all things being equal. Stuff like checking spring heights and using shims if necessary, checking the rocker pattern across the valve tip for proper geometry, etc. Takes a lot of effort and time but it does amount to something. Blueprinting is cool!

Sorry for getting slightly off topic and asking about obvious things, but I think these details are relevant to the final product.

It's impressive that you're going to all this effort with lo-po factory iron castings though.