72-76 Cylinder Head Mods?

Let me ask you a question. Can you afford to do a motor twice, or maybe 3 times. There are something’s that are ill advised for you to do yourself. Cleaning an engine block can be done, but if you don’t do it right, you will ruin the engine when you start it. Cleanliness is absolutely essential and good machining as well. There are a lot of little things that can trip you up when building an engine, and when you make a mistake you’ll be doing the engine again and again. Can you afford that?

 

Look in this thread,

http://www.v8buick.com/index.php?threads/next-step-for-my-350.292865/page-14#post-2777240

There is a nice article about porting 350 Buick heads. The principles are the same. They have a CNC program for porting Edelbrock Buick heads. That is the way I would go if I bought those heads. I would buy them as bare castings for sure.

As far converting 455 heads to Stage1, the area around the valves needs to be relieved.

http://www.buickperformanceclub.com/455hdcompare.htm