Just wanted to bounce some ideas off your heads. I read that a "blue block" frequently is the best block to start with. I understand the negative side of '75-76 heads, are the 79cc combustion chambers. If I were building an engine with a set of Molnar rods and the TA (SRP?) pistons, what would stop me from just using the 9cc flat top, and still ending up over 10:1? If my math is correct, .020" in the hole I still end up around 10.5:1. Even with small valves, something like a ta 212, b4b, and long tubes should make for a tame, torquey 400ish hp/5500 rpm bullet, no? If not, what about these heads am I missing?
The heads are open chamber and no where near as good for performance as the 67-74 closed chamber heads. With the piston and rod choices available today, for a few dollars more you can get a piston that will go in at 0 deck and you can build a 482. Then when budget allows, buy a set of aluminum heads and bolt them on, Not all blue blocks are superior, they can suffer from core shift as well. The bottom picture represents what the 75-76 heads look like, open chamber, the top is the earlier, closed chamber heads.
X2 on what Larry said. Just because it's a blue block doesn't mean it's necessarily better. Even though you are only looking for a mild bump over stock you should still read this about core shift. http://www.v8buick.com/index.php?th...ck-why-sonic-checking-is-so-important.171953/ Also remember that the factory compression ratings were not as high as published.
They aren't, the pictures are only to represent the difference between open and closed chamber heads.
Thanks guys. I know core shift is still possible in a late block, just playing to the general consensus on that topic. What, aside from their volume, actually makes the chambers worse than a closed chamber? Does it pertain to the flame travel or something, or is it just the volume of it?
It has to do with quench, http://www.superchevy.com/how-to/engines-drivetrain/94138-piston-head-clearance-guide https://www.hotrod.com/articles/0209hpp-engine-combustion-chamber/
